- Open Access
Preconception care: caffeine, smoking, alcohol, drugs and other environmental chemical/radiation exposure
Reproductive Health volume 11, Article number: S6 (2014)
As providing health education, optimizing nutrition, and managing risk factors can be effective for ensuring a healthy outcome for women and her yet un-conceived baby, external influences play a significant role as well. Alcohol, smoking, caffeine use and other similar lifestyle factors, have now become an integral part of the daily life of most men and women, who use/misuse one or more of these harmful substances regularly despite knowledge of their detrimental effects. The adverse health outcomes of these voluntary and involuntary exposures are of even greater concern in women of child bearing age where the exposure has the potential of inflicting harm to two generations. This paper is examining the available literature for the possible effects of caffeine consumption, smoking, alcohol or exposure to chemicals may have on the maternal, newborn and child health (MNCH).
A systematic review and meta-analysis of the evidence was conducted to ascertain the possible impact of preconception usage of caffeine, tobacco, alcohol and other illicit drugs; and exposure to environmental chemicals and radiant on MNCH outcomes. A comprehensive strategy was used to search electronic reference libraries, and both observational and clinical controlled trials were included. Cross-referencing and a separate search strategy for each preconception risk and intervention ensured wider study capture.
Heavy maternal preconception caffeine intake of >300mg/d significantly increase the risk of a subsequent fetal loss by 31% (95% CI: 8-58%). On the other hand, preconception alcohol consumption leads to non-significant 30% increase in spontaneous abortion (RR 1.30; 95% CI: 0.85-1.97). Preconception counselling can lead to a significant decrease in the consumption of alcohol during the first trimester (OR 1.79; 95% CI: 1.08-2.97). Periconception smoking, on the other hand, was found to be associated with an almost 3 times increased risk of congenital heart defects (OR 2.80; 95% CI 1.76-4.47). While the review found limited evidence of preconception environmental exposure on maternal, newborn and child health outcomes, occupational exposure in female radiation workers before conception showed an increased impact in risk of early miscarriages.
Identification of substance abuse and environmental history during preconception period provides an opportunity to assist women in reducing major health risks and identify key determinants of healthy pregnancy. Studies have shown that the aversion and prevention of exposure feasibility can play an important role in improving the health of women and their families, however, the results should be interpreted with great caution as there were few studies in each section. Therefore, there is a need for more rigorous studies to test the hypotheses.
While factors like maternal nutritional status, disease control and reproductive planning are critical in ensuring a healthy outcome for women and their future offspring, exposure to drugs and chemicals play a significant role as well. Alcohol, smoking, caffeine use and other similar lifestyle factors, have now become an integral part of the daily life of most men and women, who use/misuse one or more of these harmful substances regularly despite knowledge of their detrimental effects. Exposure to reproductive and developmental toxicants in the environment (at home and at the workplace) is of concern. The adverse health outcomes of these exposures are of even greater concern in women of child bearing age where the exposure has the potential to inflict harm to her baby in utero as well.
Alcohol is a known teratogen and prenatal alcohol use is an important preventable cause of maternal morbidity and neonatal birth defects and developmental disabilities. A recent National Survey on Drug Use and Health  quoted rates of current alcohol use to be 57% in adult females and rates of binge drinking (≥5 drinks on the same occasion) to be approximately 25% in the United States. Smoking is another factor that leads to known maternal and fetal complications during pregnancy and almost one third of women of child-bearing age smoke . Exposure to caffeine during pregnancy has been associated with an increased risk of spontaneous abortion and low birth weight . Often, these habits begin during adolescence, only to be consolidated as young men and women become adults. Many young women continue to be exposed to these harmful substances during the first trimester without realizing they are pregnant, exposing the fetus to the toxic effects of substance use during organogenesis, resulting in long-lasting effects on the child’s physical and mental development. Alcohol, tobacco and illicit drug use are often so deeply engrained that many continue use even during pregnancy as shown by the National Survey of Drug Use and Health (NSDUH) survey. The survey reported that almost 11% of the pregnant women stated current alcohol use and 5% of pregnant women use some form of illicit drugs . More than 80% of pregnant women also attested to consuming some form of caffeine in another study . Alongside these, there are environmental and occupational hazards with teratogenic potential and a woman’s professional and residential activities may pose risks for her before pregnancy. These are not limited to work-related exposures to radiation, but also encompass contact with substances like lead in paints, mercury from consumption of seafood, or pesticides in the soil.
These risks and the interventions to prevent and avoid them are an important component of preconception care. In this review, preconception care is defined as “any intervention provided to women and couples of childbearing age, regardless of pregnancy status or desire, before pregnancy, to improve health outcomes for women, newborns and children”. Periconceptional care, on the other hand, is any intervention provided to women of childbearing age preceding conception but that continues into the first trimester, to improve health outcomes for women, newborns and children .
This systematic review was conducted to synthesize the evidence linking each of these potentially avoidable risk factors during preconception period and their impact on maternal, newborn and child health (MNCH) outcomes. The review also identified and assessed the impact of interventions for avoiding the usage of caffeine, tobacco, alcohol and other illicit drugs; and exposure to environmental or workplace chemicals and radiation that have shown promising results on MNCH.
This paper systematically reviewed all the literature published up to 2011 to identify studies describing the effectiveness of preconception risks and intervention to prevent and avoid substance abuse and environmental and workplace exposure to chemicals and radiations for improved maternal, newborn and child health (MNCH) outcomes. Electronic databases such as PubMed, Cochrane Libraries, Embase, and WHO Regional Databases were searched to identify the experimental and observational studies on the subject. Papers were also identified by hand searching references from included studies. No language or date restrictions were applied in the search. The findings were presented at international meeting [5, 6]and shared with professionals in the relevant fields of maternal and child health, following which results were updated based on current searches (through end of 2012) and expert opinion. Studies were included if they reported the effectiveness of interventions for and risks to substance abuse and environmental exposure on MNCH outcomes. The methodology is described in detailed elsewhere .
Two authors assessed the eligibility of studies and extracted data and judged the quality on standardized sheets. The quality of experimental studies were assessed using Cochrane criteria , whereas STROBE guidelines were used to assess the quality of observational studies . We conducted meta-analyses for individual studies and pooled statistics was reported as the odds ratio (OR) and relative risk (RR) between the experimental and control groups with 95% confidence intervals (CI). Mantel–Haenszel pooled RR and corresponding 95% CI were reported or the Der Simonian–Laird pooled RR and corresponding 95% CI where there was an unexplained heterogeneity. Since most of the studies were observational in design, therefore, we used generalized inverse variance (GIV) method to pool data which is a better way to run a comparative analysis . All analyses were conducted using the software Review Manager 5.1 . Heterogeneity was quantified by Chi2 and I2, in situations of high heterogeneity, causes were explored through sub-group analysis and random effect models were used.
The search identified 1491 papers. After the initial title and abstract screening, 40 full texts were reviewed to assess which papers met the inclusion criteria and had the outcomes of our interest. Thirty nine studies were finally selected for abstraction and analysis (Figure 1). On quality assessment, observational studies often had inadequate description of the quantitative exposure, and instead categorized exposure as high versus low with variable cutoffs used in each study. Studies had limited quality with respect to statistical analysis and adjustment for confounders. Overall studies were of moderate quality. The quality of intervention studies was compromised with respect to selection, performance and reporting bias. Information related to each included study can be found on the following link:
Periconceptional caffeine intake
With regards to preconception caffeine intake, some studies have concluded that a high daily intake of caffeine prior to pregnancy leads to an increased risk of spontaneous abortion [2, 11, 12] while others reported no association [13–15].
A total of six observational studies (3 prospective and 2 retrospective) [2, 11, 12, 16–18] were identified on the effect of preconception caffeine intake on fetal loss. Of these, 5 were included in meta-analysis as one study  failed to provide data on the quantity of caffeine ingested. The review categorized the level of caffeine intake into >300mg/day, >420mg/day and >900mg/day and compared with an intake <150mg/day. Caffeine intake was found to be significantly associated with fetal loss: >300mg/day (RR 1.31; 95% CI: 1.08-1.58), intake >420mg/day (RR 6.11; 95% CI: 5.12-7.29) and >900mg/day (RR 1.72; 95% CI: 1.00-2.96). Although the forest plot cannot be interpreted for a dose-response relationship due to limitations with regards to a comparison group (mentioned in the forest plot), each individual study had reported a non-significant increase in risk of spontaneous abortion with daily increased caffeine consumption (Figure 2).
Prenatal alcohol exposure is associated with spontaneous abortion, prenatal and postnatal growth restriction and birth defects [19–21]. It is one of the leading causes of neurodevelopmental deficits in children in the United States, as a result of fetal alcohol spectrum disorder (FASD) [22–26].
Population-based behavior modification interventions (reduction of alcohol use and improved contraception) in women of child-bearing age show promise [27–29]. Content of preconception care for reducing alcohol intake includes screening of all women of reproductive age, intervention for those who are consuming it excessively (>7 drinks/week or > 3 drinks on 1 occasion), counseling about the adverse effects on pregnancy outcomes, promotion of abstinence programs for those with alcohol dependency and encouragement of consistent contraceptive use for those not in control of their drinking habits.
The review identified eight [2, 19, 30–36] risk aversion and two intervention studies [29, 37] dealing with both pre- and periconception drinking as well as interventions during these same periods to alter drinking behavior among women. The analysis showed a non-significant 30% increase in the risk of occurrence of spontaneous abortions with preconception alcohol consumption (Figure 3).
Another study  displayed a non-significant increased odds of neural tube defects (NTDs) with preconception alcohol intake (OR 1.24; 95% CI: 0.92-1.68), while preconception binge drinking was associated with 20% greater risk of NTDs when compared with alcohol intake of 1 drink/day. Periconception alcohol consumption was also found to be associated with esophageal atresia with or without tracheo-esophageal fistula (RR 1.26; 95% CI: 1.03-1.56). While Carmichael et al.  did not find any association of periconceptional alcohol exposure with congenital heart defects (OR 0.96; 95% CI: 0.91-1.01), Mullany et al.  displayed a non-significant increased risk of conotruncal heart defects with alcohol intake once weekly (RR 1.6; 95% CI: 0.8-3.0) compared to none..
The review also found an association of preconception substance abuse with depression . Analysis showed higher rate of depression among alcohol users however the rates of depression increased with combined use of alcohol and other drugs compared to when alcohol was taken alone (RR 1.94; 95% CI: 1.38-2.73).
Preconception counselling  led to a significant decrease in the consumption of alcohol during the first trimester (OR 1.79; 95% CI: 1.08-2.97) however the decrease in binge drinking episodes (OR 1.51; 95% CI: 0.63-3.62) was not significant. There was no association of preconception counselling and continuing to drink through the rest of pregnancy (OR 0.95; 95% CI: 0.59-1.53). Another paper  found an impact on reducing the rates of alcohol exposed pregnancy (AEP) amongst those who consumed more than 8 drinks per week through motivational interviewing. On three months follow up the odds of being at reduced risk of AEP was 2.31 (95% CI 1.69-3.20); at 6 months the odds was 2.15 (CI1.52-3.06); and at 9 months the odds was 2.11 (CI1.47-3.03). This intervention also led to a significant increase in the use of effective contraception (OR 2.18; 95% CI: 1.80-2.64) thereby significantly reducing the risk of an AEP (OR 2.20; 95% CI: 1.81-2.68). This finding was in accordance to the results of another trial  of a behavioural intervention where 74% of women were no longer at risk for AEP at 1 month post-intervention (Figure 4).
Pre and Peri conception smoking
Fetal effects of exposure to maternal smoking include intrauterine growth restriction (IUGR), prematurity, LBW, congenital malformations [39–44] and sudden infant death syndrome . In the past two decades many clinical trials have demonstrated the effectiveness of smoking cessation interventions in early pregnancy.
The content of preconception care for women who smoke includes: screening of all women of child-bearing age using evidence-based guidelines, treatment of dependence before planning a pregnancy, informing women about the adverse pregnancy outcomes associated with tobacco consumption, discussion of possible interventions to assist in quitting (including the use of medications) and referring to intensive counseling services where necessary.
The review identified seven risk aversion studies [30, 32, 34, 35, 47–50] and one intervention study  on the effect of preconception smoking cessation. A study by Haas et al.  showed that preconception smoking was significantly associated with preterm births (OR 2.2; 95% CI: 1.29-3.75). On the other hand, no impacts were seen on orofacial defects (OR 1.17; 95% CI: 0.89-1.52) [32, 34, 48] and NTDs whether the consumption was greater or less than a pack per day (OR 0.80; 95% CI: 0.59-1.08) .
Periconception smoking was significantly associated with 3 folds increased risk of congenital heart defects (OR 2.80; 95% CI 1.76-4.47) (Figure 5) , while no association was found between exposure and esophageal atresia with or without tracheoesophageal fistula (RR 0.95; 95% CI: 0.76-1.19)  and congenital diaphragmatic hernia (OR 1.10; 95% CI: 0.91-1.33) .
On comparing light smoking (<14 cigarettes/day) with heavy (>25 cigarettes/day) in the periconception period (1 month before pregnancy till the end of the 1st trimester), light smoking was associated with non-significant 17% lower risk of heart defects than heavy smoking (RR 0.83; 95% CI: 0.65-1.07) . On assessing the effect of preconception parental smoking on the risk of childhood leukemia, it was seen that paternal smoking was significantly associated with a greater risk (OR 0.99; 95% CI: 0.66-1.47), whereas, maternal smoking was not associated with risk of developing leukemia in the childhood period (OR 0.99; 95% CI: 0.66-1.47) .
The review identified one intervention study that compared the effectiveness of preconception counseling with standard care and found 3 times greater likelihood of women quitting smoking in the post-intervention group, although the association was not statistically significant (2.94; 95% CI: 0.70-12.36) .
Illicit drugs consumption
Maternal substance abuse is associated with pregnancy complications, LBW, an increased risk of infant mortality, neonatal abstinence syndrome, ineffective parenting techniques, child abuse and neglect, and possible increased likelihood of human immunodeficiency virus (HIV) transmission. Substance abuse also is often associated with other social and health problems that affect both the mother and infant, including domestic violence, poverty, homelessness, sexual abuse, psychiatric disorders, and poor health care .
The review aimed to assess the effects of preconception abuse of illicit drugs and possible interventions to reduce the level of abuse amongst women of reproductive age before conception Preconception care includes identification of women who are consuming illicit drugs, counseling on the risks associated with preconception use of various drugs, informing about programs that support abstinence and treatment and promoting the importance of contraception until cessation of use is achieved.
The review found a limited number of risk aversion [30, 36, 52, 53] and intervention studies [54, 55] concerned with the MNCH effects of periconception substance abuse. Paternal periconception use of illicit drugs overall did not have an association with the risk of NTDs (RR 1.07; 95% CI: 0.87-1.31) , however a significant association was found with heroin use alone (RR 1.63; 95% CI: 1.23-2.16). Maternal use of recreational drugs during the periconception period had no impact on occurrence of NTDs (RR 0.91; 95% CI: 0.77-1.07) [30, 52] (Figure 6). Comparing parental use (combined or individual) versus no use did not yield any significant association with NTD risk .
A strong association was found between recreational drug use in the month in which conception occurred and incidence of gastroschisis, although this evidence came from a single case-control study (OR 1.76; 95% CI: 0.99-3.13) . A significant association was also found between substance abuse before pregnancy and maternal depression (OR 9.60; 95% CI: 1.80-51.20) .
Amongst the two interventional studies, one studied the health seeking behavior of substance-abused women using the ‘Steps of Change’ model . The other compared the effect of behavioral couple’s therapy (BCT) with individual-based therapy (IBT) amongst substance-abusing men and assessed its impact on incidence of partner violence . It reported that post-intervention, male-to-female aggression in the BCT group was lower than in the IBT group (17% vs. 43%). Also husbands in the BCT group reported fewer days of drug use, longer episodes of abstinence, and less drug-related hospitalizations or arrests.
Ameliorating environmental exposures
Ionizing radiation is known to have harmful effects on the reproductive systems of both males and females . It is one of the few known factors to increase the likelihood of childhood cancers. The danger to the embryo and fetus of intrauterine ionizing radiation exposure is well documented [57, 58]. While some studies have found a significant association between preconception paternal exposure to ionizing radiation and non-Hodgkin’s lymphoma in their children [59–61] others found a weak, non-significant association  or no association at all [63–67]. Studies have also shown a significant elevated risk of childhood cancers in children born to exposed female radiation workers [60, 61].
Ionizing radiation exposure is composed of both, occupation-related exposure as well as non-occupational exposure. The content of preconception care with respect to environmental exposures consists of taking a detailed history of the couple to identify possible sources of radiation exposure, informing women of child-bearing age about the possible deleterious effects (miscarriage, stillbirths, childhood cancer) of such exposure, on their health as well as that of the fetus, especially during the time where a woman does not yet know she is pregnant..
Both occupational [62, 68, 69] and non-occupational [33, 34, 70] radiation exposure were analyzed separately. One reported the effect of preconception occupational radiation exposures in women on fetal death . This study showed an increased risk of early miscarriage in mothers who were exposed to radiation in the workplace (RR 1.32; 95% CI: 1.04-1.66). This association was stronger in women who were monitored within 6 months of conception (RR 1.50; 95% CI: 1.20-1.87) . There was also a non-significant association with stillbirths a (RR 2.30; 95% CI: 0.80-6.62) and second trimester miscarriage (RR 0.50; 95% CI: 0.20-1.26) .
Both paternal and maternal exposure to preconception ionizing radiation at work led to an overall greater risk of childhood cancers (RR 1.29; 95% CI: 1.02-1.63; and RR 1.19; 95% CI: 0.92-1.54 respectively) (Figure 7 and Figure 8), however this association was only significant for maternal exposure. This finding is not in conjunction with the results of Bunch et al.  on the effect of preconception maternal radiation exposure on all childhood cancers (RR 1.90; 95% CI: 0.84-4.58). However, on pooling these studies, a significant association between exposure and outcomes was found (RR 1.33; 95% CI: 1.06-1.67). Studies looking at the effect of radiation dose on the incidence of childhood hematological malignancies had equivocal results [60, 62, 67, 72–74]. However, many had samples too small to comment on the significance of their findings.
Non-occupational exposure to ionizing radiation via X-rays is associated with higher rates of adverse fetal and neonatal outcomes. Paternal exposure is associated with low mean birth weight (MD -73.00; 95% CI: -78.97, -67.03)  and reduced intrauterine growth (MD -53.00; 95% CI: -58.21, -47.79) . There was no data available for possible effects of maternal preconception exposure on these outcomes. Parental X-ray exposure before conception also had an association with childhood cancers, especially between paternal abdominal exposure and leukemia in the offspring .
An increasing body of scientific research provides disconcerting verification of the potential impact of environmental toxins that greatly affect human reproductive health and human development. It is believed that roughly 3% of fetal developmental defects are attributable to chemical exposures . Toxic chemical exposures include organic solvents, metals, pesticides, polychlorinated biphenyl (PCB). Adverse outcomes associated with chemical exposures include LBW , spontaneous abortion, preterm birth, stillbirth/infant death, congenital anomalies , developmental delays , and childhood cancers .
This section reviewed literature for effects of exposure among either parent in the preconception period on the subsequent pregnancy and its outcomes. Early spontaneous abortions were defined as <12 weeks of gestation; >12 weeks but <20 weeks of gestation was classified as late spontaneous abortion. The content of preconception care with respect to environmental exposures consists of taking a detailed history of the couple to identify possible sources of toxic exposure, informing women of child-bearing age about the deleterious effects of such exposure, at home or at the workplace, on their health as well as that of the fetus, in case of an unknown pregnancy status.
The review found very limited evidence [80–89] regarding parental toxic exposure and effects on MNCH outcomes. Preconception exposure to pesticides was associated with 27% increase in spontaneous abortions (p <0.001); 31% increase in early spontaneous abortions (p=0.0007) and 22% increase in late spontaneous abortions (>12 weeks) (p=0.03) . Paternal exposure to pesticides in the year before conception also showed an increase in the rates of hematological malignancies in their offspring [90–94].
Analysis of studies on parental exposure to chemicals like paints, solvents, industrial products etc. showed a 10% (p=0.02) increase in the risk of acute lymphoblastic leukemia (ALL) in subsequent offspring , similarly, the risk of ALL was 44% higher with maternal exposure (p<0.001) [81, 82]. McKinney et al.  also found that exposure to dermal hydrocarbons and metal during the preconception period was linked to an increased risk ofleukemia and ALL. Vincetiet al.  reported an excess risk of cardiovascular defects (OR 2.59; 95% CI: 1.68-3.82) in a lead-polluted area.
Women who reported using wood to cook during the the periconception period had 3 folds increased risk of having infants with a NTD (95% CI:1.70-6.21) . Another study reported that women who used wood, coal or tires in their home for cooking or heating had twice the odds of having a child with anencephaly compared with women not using this kind of fuel (OR 2.04; 95% CI: 1.29-3.23) .
Another area of unavoidable environmental exposure is that of traffic-related particulate air pollution. Perin et al. showed that the risk of early pregnancy loss in women exposed to high levels of ambient particulate matter (>56.72 mg/m3) during the preconceptional period was almost 3-fold higher compared to women exposed to lower levels. The review also found evidence on the effect of bed-heating devices on the occurrence of certain birth defects (NTDs and orofacial defects), none of which were significant .
A growing number of women in their reproductive years continue to consume caffeine, alcohol, tobacco or illicit drugs. Moreover, increasing evidence from observational and epidemiological studies is supporting the linkages of harmful environmental exposures with human health and reproduction. While it is distressing that women (and men) continue to put themselves at risk, it is therefore important that measures should be taken to ameliorate these risk factors. This review found that heavy preconception caffeine consumption of >300mg/d significantly increased the risk of subsequent fetal loss by 31%. However, the association and mechanism by which caffeine intake affects MNCH outcomes is still not understood. Further research is also needed to assess the link between pre-gestational use of caffeine and spontaneous abortion. More specific research may help to elaborate on this in order to find a relatively safe cut-off. Preconception care, therefore, requires early identification of women who consume caffeine more than occasionally. Such women need to be informed of the potential risks of adverse pregnancy outcomes associated with caffeine intake (spontaneous abortion, low birth-weight). Cutting down to minimal or no caffeine intake should be the goal well in advance of a conception.
Although a positive pregnancy test may lead to a significant decrease in the alcohol use of many women, the intervening time lapse between that and conception are critical periods of fetal susceptibility to alcohol while the development of major organs is occurring. Alcohol consumption before or around the time of conception is linked to multiple adverse fetal outcomes including spontaneous abortion, gastrointestinal malformations and NTDs. None of these associations reach a level of statistical significance. Pre-pregnancy alcohol consumption is also correlated with maternal depression. Both preconception counselling as well as behavioural interventions have led to a significant improvement in drinking behaviour and thus pregnancies affected by alcohol. It is now required to use this important information to upgrade these interventions to have stronger, longer-lasting and more widespread effects.
Women, who are habitual smokers, put their health and that of their unborn child in jeopardy, as preconception and peri-conception smoking significantly increase the threat of preterm births by twice as much and also raises the risks of congenital defects in the fetus. In order to reduce the chances of the adverse effects delineated above, effective interventions for women of reproductive age who smoke should be implemented during preconception period and at a large scale. Although preconception counseling does improve practices in women pertaining to their smoking habits, behavioral interventions in synergy with general preconception counseling may play a more significant part. Hence it is important to motivate women of reproductive age to quit smoking before they conceive. Substantial research literature exists for interventions to quit smoking cessation among adults, women in general and pregnant women, however there is a dearth of clinical studies focusing specifically on non-pregnant women of childbearing age.
On the other hand, the current literature available to study the effect of preconception parental exposure to ionizing radiation on MNCH outcomes is limited, especially for fetal and early neonatal effects. The analyses showed some association of maternal exposure to radiation with early miscarriages and childhood cancers, and paternal exposure to X-ray with increased cases of childhood cancer.
In conclusion, there was a paucity of literature on the MNCH effects of exposure to various environmental agents in the preconception period. Although our data suggests a significant effect of preconception pesticide exposure on all spontaneous abortions and of preconception exposure to other chemicals (solvents, paints, industrial dust etc.) on the risk of ALL in their offspring, these results should be interpreted with great caution as only a small amount of relevant studies were pooled and analyzed. This clearly delineates the work for future research as countless environmental agents still need to be studied for their effects on MNCH outcomes. Only then will comprehensive interventions to reduce exposure be designed and evaluated for a final formation of a sound policy dealing with this topic. They should be advised to avoid eating shark, swordfish, king mackerel, and tile fish to reduce possible exposure to mercury. Women with a history of lead poisoning should be counseled on the risk on the unborn child.
The review found paucity of studies conducted in preconception period and reported MNCH outcomes. The number of experimental studies was too few and majority of the included studies were observational in nature. Although the association was studied well, there were small number of studies in each section and their quality was compromised. Therefore, the results from this review should be interpreted with great caution. The complete description of the exposure was also not reported in each study and the categorization of dosage of intake and severity of exposure varied across all the studies. Another limitation was the description of timing of exposure. Studies reported maternal or paternal preconception exposure, but failed to underscore the exact time and duration. Therefore, there is a need for more rigorous studies to test the hypotheses. With the rising epidemiological trends of smoking, alcohol and illicit drugs consumption in low and middle income countries, it is important that more studies should be conducted in these countries as well.
Use of caffeine, alcohol, and other illicit drugs and exposure to environmental exposure to radiation and chemical solvents put a significant health risks to the health of women and their children. Identification of substance abuse and environmental history during preconception period provides an opportunity to assist women in reducing major health risks and identify key determinants of healthy pregnancy. Studies have shown that the aversion and prevention of exposure feasibility can play an important role in improving the health of women and their families.
Peer review reports are included in additional file 1.
National Survey on Drug Use and Health https://nsduhweb.rti.org/. 2010, [accessed on April 29,2013 ]
Tolstrup JS, Kjaer SK, Munk C, Madsen LB, Ottesen B, Bergholt T, Gronbaek M: Does caffeine and alcohol intake before pregnancy predict the occurrence of spontaneous abortion?. Human Reproduction. 2003, 18 (12): 2704-10.1093/humrep/deg480.
Wisborg K, Kesmodel U, Bech BH, Hedegaard M, Henriksen TB: Maternal consumption of coffee during pregnancy and stillbirth and infant death in first year of life: prospective study. BMJ. 2003, 326 (7386): 420-422. 10.1136/bmj.326.7386.420.
Dean SV, Lassi ZS, Imam AM, Bhutta ZA: Preconception Care: closing the gap in the continuum of care to accelerate improvements in maternal, newborn and child health. Reproductive Health. 2014
Dean S, Rudan I, Althabe F, Girard AW, Howson C, Langer A, Lawn J, Reeve M-E, Teela KC, Toledano M: Setting research priorities for preconception care in low-and middle-income countries: aiming to reduce maternal and child mortality and morbidity. PLoS Med. 2013, 10 (9): e1001508-10.1371/journal.pmed.1001508.
WHO WHO: Meeting to develop a global consensus on preconception care to reduce maternal and childhood mortality and morbidity. 2012, Geneva: World Health Organization Headquarters
Cochrane Handbook for Systematic Reviews of Interventions. Version 5.0.0 [updated February 2008]. The Cochrane Collaboration. Edited by: Higgins JPT, Green S. 2008, Available from http://www.cochranehandbook.org
Brand RA: Editorial: standards of reporting: the CONSORT, QUORAM, and STROBE guidelines. Clin Orthop Relat Res. 2009, 467 (6): 1393-1394. 10.1007/s11999-009-0786-x.
Curtis LH, Hammill BG, Eisenstein EL, Kramer JM, Anstrom KJ: Using Inverse Probability-Weighted Estimators in Comparative Effectiveness Analyses With Observational Databases. Med Care. 2007, 45: S103-107. 10.1097/MLR.0b013e31806518ac.
Review Manager (RevMan). [computer program]. Version 5.0:. 2008, Copenhagen: Nordic Cochrane Collaboration
Axelsson G, Rylander R, Molin I: Outcome of pregnancy in relation to irregular and inconvenient work schedules. British journal of industrial medicine. 1989, 46 (6): 393-
Fenster L, Hubbard AE, Swan SH, Windham GC, Waller K, Hiatt RA, Benowitz N: Caffeinated beverages, decaffeinated coffee, and spontaneous abortion. Epidemiology. 1997, 8 (5): 515-523. 10.1097/00001648-199709000-00008.
Gadsby R, Barnie-Adshead AM, Jagger C: A prospective study of nausea and vomiting during pregnancy. The British Journal of General Practice. 1993, 43 (371): 245-
Cnattingius S, Signorello LB, Anneren G, Clausson B, Ekbom A, Ljunger E, Blot WJ, McLaughlin JK, Petersson G, Rane A: Caffeine intake and the risk of first-trimester spontaneous abortion. New England Journal of Medicine. 2000, 343 (25): 1839-10.1056/NEJM200012213432503.
Lawson CC, LeMasters GK, Wilson KA: Changes in caffeine consumption as a signal of pregnancy. Reproductive Toxicology. 2004, 18 (5): 625-633. 10.1016/j.reprotox.2004.03.004.
Dominguez-Rojas V, de Juanes-Pardo JR, Astasio-Arbiza P, Ortega-Molina P, Gordillo-Florencio E: Spontaneous abortion in a hospital population: are tobacco and coffee intake risk factors?. European journal of epidemiology. 1994, 10 (6): 665-668. 10.1007/BF01719278.
Wen W, Shu XO, Jacobs DR, Brown JE: The associations of maternal caffeine consumption and nausea with spontaneous abortion. Epidemiology. 2001, 12 (1): 38-42. 10.1097/00001648-200101000-00008.
Infante-Rivard C, Fernandez A, Gauthier R, David M, Rivard GE: Fetal loss associated with caffeine intake before and during pregnancy. Jama. 1993, 270 (24): 2940-10.1001/jama.1993.03510240052031.
Windham GC, Von Behren J, Fenster L, Schaefer C, Swan SH: Moderate maternal alcohol consumption and risk of spontaneous abortion. Epidemiology. 1997, 509-514.
Kesmodel U, Wisborg K, Olsen SF, Brink Henriksen T, Jorgen Secher N: Moderate alcohol intake in pregnancy and the risk of spontaneous abortion. Alcohol and Alcoholism. 2002, 37 (1): 87-10.1093/alcalc/37.1.87.
Kesmodel U, Wisborg K, Olsen SF, Henriksen TB, Secher NJ: Moderate alcohol intake during pregnancy and the risk of stillbirth and death in the first year of life. American journal of epidemiology. 2002, 155 (4): 305-10.1093/aje/155.4.305.
Coles CD: Impact of prenatal alcohol exposure on the newborn and the child. Clinical obstetrics and gynecology. 1993, 36 (2): 255-10.1097/00003081-199306000-00007.
Coles CD, Platzman KA: Behavioral development in children prenatally exposed to drugs and alcohol. Substance Use & Misuse. 1993, 28 (13): 1393-1433. 10.3109/10826089309062192.
Stratton KR, Howe CJ, Battaglia FC: Fetal alcohol syndrome: Diagnosis, epidemiology, prevention, and treatment. 1996, National Academies
Mattson SN, Schoenfeld AM, Riley EP: Teratogenic effects of alcohol on brain and behavior. Alcohol Research & Health. 2001, 25 (3): 185-192.
Riley EP, Mattson SN, Li TK, Jacobson SW, Coles CD, Kodituwakku PW, Adnams CM, Korkman MI: Neurobehavioral consequences of prenatal alcohol exposure: an international perspective. Alcoholism: Clinical and Experimental Research. 2003, 27 (2): 362-373. 10.1097/01.ALC.0000052703.38558.B2.
Ingersoll K, Floyd L, Sobell M, Velasquez MM: Reducing the risk of alcohol-exposed pregnancies: a study of a motivational intervention in community settings. Pediatrics. 2003, 111 (5 Part 2): 1131-
Ingersoll KS, Ceperich SD, Nettleman MD, Karanda K, Brocksen S, Johnson BA: Reducing alcohol-exposed pregnancy risk in college women: initial outcomes of a clinical trial of a motivational intervention. Journal of substance abuse treatment. 2005, 29 (3): 173-180. 10.1016/j.jsat.2005.06.003.
Floyd RL, Sobell M, Velasquez MM, Ingersoll K, Nettleman M, Sobell L, Mullen PD, Ceperich S, von Sternberg K, Bolton B: Preventing Alcohol-Exposed Pregnancies: A Randomized Controlled Trial. American Journal of Preventive Medicine. 2007, 32 (1): 1-10. 10.1016/j.amepre.2006.08.028.
Shaw GM, Velie EM, Morland KB: Parental recreational drug use and risk for neural tube defects. American journal of epidemiology. 1996, 144 (12): 1155-10.1093/oxfordjournals.aje.a008894.
Wong Gibbons DL, Romitti PA, Sun L, Moore CA, Reefhuis J, Bell EM, Olshan AF: Maternal periconceptional exposure to cigarette smoking and alcohol and esophageal atresia±tracheo esophageal fistula. Birth Defects Research Part A: Clinical and Molecular Teratology. 2008, 82 (11): 776-784. 10.1002/bdra.20529.
Malik S, Cleves MA, Honein MA, Romitti PA, Botto LD, Yang S, Hobbs CA: Maternal smoking and congenital heart defects. Pediatrics. 2008, 121 (4): e810-10.1542/peds.2007-1519.
Carmichael SL, Shaw GM, Yang W, Lammer EJ: Maternal periconceptional alcohol consumption and risk for conotruncal heart defects. Birth Defects Research Part A: Clinical and Molecular Teratology. 2003, 67 (10): 875-878. 10.1002/bdra.10087.
Honein MA, Rasmussen SA, Reefhuis J, Romitti PA, Lammer EJ, Sun L, Correa A: Maternal smoking and environmental tobacco smoke exposure and the risk of orofacial clefts. Epidemiology. 2007, 18 (2): 226-10.1097/01.ede.0000254430.61294.c0.
Caspers KM, Oltean C, Romitti PA, Sun L, Pober BR, Rasmussen SA, Yang W, Druschel C: Maternal periconceptional exposure to cigarette smoking and alcohol consumption and congenital diaphragmatic hernia. Birth Defects Research Part A: Clinical and Molecular Teratology. 2010
Harrison PA, Sidebottom AC: Alcohol and drug use before and during pregnancy: An examination of use patterns and predictors of cessation. Maternal and child health journal. 2009, 13 (3): 386-394. 10.1007/s10995-008-0355-z.
Elsinga J, de Jong-Potjer LC, van de Pal-de Bruin KM, le Cessie S, Assendelft WJJ, Buitendijk SE: The effect of preconception counselling on lifestyle and other behaviour before and during pregnancy. Women's Health Issues. 2008, 18 (6S): 117-125.
Mullally A, Cleary BJ, Barry J, Fahey TP, Murphy DJ: Prevalence, predictors and perinatal outcomes of peri-conceptional alcohol exposure- retrospective cohort study in an urban obstetric population in Ireland. BMC Pregnancy and Childbirth. 2011, 11 (1): 27-10.1186/1471-2393-11-27.
Honein MA, Paulozzi LJ, Moore CA: Family history, maternal smoking, and clubfoot: an indication of a gene-environment interaction. American journal of epidemiology. 2000, 152 (7): 658-10.1093/aje/152.7.658.
Li DK, Mueller BA, Hickok DE, Daling JR, Fantel AG, Checkoway H, Weiss NS: Maternal smoking during pregnancy and the risk of congenital urinary tract anomalies. American Journal of Public Health. 1996, 86 (2): 249-10.2105/AJPH.86.2.249.
Källen K: Maternal smoking and urinary organ malformations. International Journal of Epidemiology. 1997, 26 (3): 571-10.1093/ije/26.3.571.
Kallen K: Maternal smoking during pregnancy and limb reduction malformations in Sweden. American Journal of Public Health. 1997, 87 (1): 29-10.2105/AJPH.87.1.29.
Källén K: Maternal smoking and orofacial clefts. The Cleft Palate-Craniofacial Journal. 1997, 34 (1): 11-16. 10.1597/1545-1569(1997)034<0011:MSAOC>2.3.CO;2.
Chung KC, Kowalski CP, Kim HM, Buchman SR: Maternal cigarette smoking during pregnancy and the risk of having a child with cleft lip/palate. Plastic and Reconstructive Surgery. 2000, 105 (2): 485-10.1097/00006534-200002000-00001.
Werler MM: Teratogen update: smoking and reproductive outcomes. Teratology. 1997, 55 (6): 382-388. 10.1002/(SICI)1096-9926(199706)55:6<382::AID-TERA5>3.0.CO;2-#.
Chamberlain C, O’Mara-Eves A, Oliver S, Caird JR, Perlen SM E, ades SJ, Thomas J: Psychosocial interventions for supporting women to stop smoking in pregnancy. Cochrane Database of Systematic Reviews. 2013, CD00105-10
Haas JS, Fuentes-Afflick E, Stewart AL, Jackson RA, Dean ML, Brawarsky P, Escobar GJ: Prepregnancy health status and the risk of preterm delivery. Archives of Pediatrics and Adolescent Medicine. 2005, 159 (1): 58-10.1001/archpedi.159.1.58.
Grewal J, Carmichael SL, Ma C, Lammer EJ, Shaw GM: Maternal periconceptional smoking and alcohol consumption and risk for select congenital anomalies. Birth Defects Res A Clin Mol Teratol. 2008, 82 (7): 519-526. 10.1002/bdra.20461.
Karatza AA, Giannakopoulos I, Dassios TG, Belavgenis G, Mantagos SP, Varvarigou AA: Periconceptional tobacco smoking and Xisolated congenital heart defects in the neonatal period. International Journal of Cardiology. 2009
Chang C, McNamara TK, Haimovici H, Hornstein MD: Problem drinking in women evaluated for infertility. The American Journal on Addictions. 2006, 15 (2): 174-179. 10.1080/10550490500528639.
Andrulis D, Hopkins S: Public hospitals and substance abuse services for pregnant women and mothers: implications for managed-care programs and Medicaid. Journal of Urban Health. 2001, 78 (1): 181-198. 10.1093/jurban/78.1.181.
van Gelder MMHJ, Reefhuis J, Caton AR, Werler MM, Druschel CM, Roeleveld N: Maternal periconceptional illicit drug use and the risk of congenital malformations. Epidemiology. 2009, 20 (1): 60-10.1097/EDE.0b013e31818e5930.
Morrison JJ, Chitty LS, Peebles D, Rodeck CH: Recreational drugs and fetal gastroschisis: maternal hair analysis in the peri-conceptional period and during pregnancy. BJOG: An International Journal of Obstetrics & Gynaecology. 2005, 112 (8): 1022-1025. 10.1111/j.1471-0528.2005.00655.x.
Brown VB, Melchior LA, Panter AT, Slaughter R, Huba GJ: Women's steps of change and entry into drug abuse treatment:: A multidimensional stages of change model. Journal of Substance Abuse Treatment. 2000, 18 (3): 231-240. 10.1016/S0740-5472(99)00049-5.
Fals-Stewart W, Kashdan TB, O'Farrell TJ, Birchler GR: Behavioral couples therapy for drug-abusing patients: Effects on partner violence. Journal of Substance Abuse Treatment. 2002, 22 (2): 87-96. 10.1016/S0740-5472(01)00218-5.
Ladner HA: Reproductive Organs. Scherer E, Streffer C, Trott KR Radiopathology of organs and tissues Berlin: Springer. 1991, 433-459.
Brill AB, Forgotson EH: Radiation and congenital malformations. American Journal of Obstetrics and Gynecology (US). 1964, 90:
Bithell JF, Stiller CA: A new calculation of the carcinogenic risk of obstetric X-raying. Statistics in medicine. 1988, 7 (8): 857-864. 10.1002/sim.4780070804.
Gardner MJ, Snee MP, Hall AJ, Powell CA, Downes S, Terrell JD: Results of case-control study of leukaemia and lymphoma among young people near Sellafield nuclear plant in West Cumbria. BMJ. 1990, 300 (6722): 423-429. 10.1136/bmj.300.6722.423.
Draper GJ, Little MP, Sorahan T, Kinlen LJ, Bunch KJ, Conquest AJ, Kendall GM, Kneale GW, Lancashire RJ, Muirhead CR: Cancer in the offspring of radiation workers: a record linkage study. British Medical Journal. 1997, 315 (7117): 1181-10.1136/bmj.315.7117.1181.
Sorahan T, Lancashire RJ, Temperton DH, Heighway WP: Childhood cancer and paternal exposure to ionizing radiation: a second report from the Oxford Survey of Childhood Cancers. American journal of industrial medicine. 1995, 28 (1): 71-78. 10.1002/ajim.4700280106.
Meinert R, Kaletsch U, Kaatsch P, Schüz J, Michaelis J: Associations between childhood cancer and ionizing radiation: results of a population-based case-control study in Germany. Cancer Epidemiology Biomarkers & Prevention. 1999, 8 (9): 793-
Sever LE, Gilbert ES, Tucker K, Greaves JA, Greaves C, Buchanan J: Epidemiological evaluation of childhood leukaemia and paternal exposure to ionizing radiation. Seattle: Battelle Memorial Institute. 1997
McLaughlin JR, King WD, Anderson TW, Clarke EA, Ashmore JP: Paternal radiation exposure and leukaemia in offspring: the Ontario case-control study. British Medical Journal. 1993, 307 (6910): 959-10.1136/bmj.307.6910.959.
Kinlen LJ, Clarke K, Balkwill A: Paternal preconceptional radiation exposure in the nuclear industry and leukaemia and non-Hodgkin's lymphoma in young people in Scotland. British Medical Journal. 1993, 306 (6886): 1153-10.1136/bmj.306.6886.1153.
Wakeford R, Parker L: Leukaemia and non-Hodgkin's lymphoma in young persons resident in small areas of West Cumbria in relation to paternal preconceptional irradiation. British Journal of Cancer. 1996, 73 (5): 672-10.1038/bjc.1996.117.
Roman E, Doyle P, Maconochie N, Davies G, Smith PG, Beral V: Cancer in children of nuclear industry employees: report on children aged under 25 years from nuclear industry family study. British Medical Journal. 1999, 318 (7196): 1443-10.1136/bmj.318.7196.1443.
Doyle P, Maconochie N, Roman E, Davies G, Smith PG, Beral V: Fetal death and congenital malformation in babies born to nuclear industry employees: report from the nuclear industry family study. The Lancet. 2000, 356 (9238): 1293-1299. 10.1016/S0140-6736(00)02812-9.
Kinlen L, Jiang J, Hemminki K: A case–control study of childhood leukaemia and paternal occupational contact level in rural Sweden. British journal of cancer. 2002, 86 (5): 732-737. 10.1038/sj.bjc.6600113.
Shea KM, Little RE: Is There an Association between Preconception Paternal X-ray Exposure and Birth Outcome?. American Journal of Epidemiology. 1997, 145 (6): 546-10.1093/oxfordjournals.aje.a009143.
Bunch KJ, Muirhead CR, Draper GJ, Hunter N, Kendall GM, O'Hagan JA, Phillipson MA, Vincent TJ, Zhang W: Cancer in the offspring of female radiation workers: a record linkage study. British journal of cancer. 2009, 100 (1): 213-218. 10.1038/sj.bjc.6604841.
Gardner MJ: Paternal occupations of children with leukemia. British Medical Journal. 1992, 305 (6855): 715-10.1136/bmj.305.6855.715.
Johnson KJ, Alexander BH, Doody MM, Sigurdson AJ, Linet MS, Spector LG, Hoffbeck RW, Simon SL, Weinstock RM, Ross JA: Childhood cancer in the offspring born in 1921–1984 to US radiologic technologists. British journal of cancer. 2008, 99 (3): 545-550. 10.1038/sj.bjc.6604516.
Little JB, Nagasawa H, Keng PC, Yu Y, Li CY: Absence of radiation-induced G1 arrest in two closely related human lymphoblast cell lines that differ in p53 status. Journal of Biological Chemistry. 1995, 270 (19): 11033-10.1074/jbc.270.19.11033.
Weck RL, Paulose T, Flaws JA: Impact of environmental factors and poverty on pregnancy outcomes. Clinical obstetrics and gynecology. 2008, 51 (2): 349-10.1097/GRF.0b013e31816f276e.
Bell ML, Ebisu K, Belanger K: Ambient air pollution and low birth weight in Connecticut and Massachusetts. Environmental Health Perspectives. 2007, 115 (7): 1118-10.1289/ehp.9759.
Ritz B, Wilhelm M, Hoggatt KJ, Ghosh JKC: Ambient air pollution and preterm birth in the environment and pregnancy outcomes study at the University of California, Los Angeles. American journal of epidemiology. 2007, 166 (9): 1045-10.1093/aje/kwm181.
Mendola P, Selevan SG, Gutter S, Rice D: Environmental factors associated with a spectrum of neurodevelopmental deficits. Mental retardation and developmental disabilities research reviews. 2002, 8 (3): 188-197. 10.1002/mrdd.10033.
Andersen HR, Nielsen JB, Grandjean P: Toxicologic evidence of developmental neurotoxicity of environmental chemicals. Toxicology. 2000, 144 (1-3): 121-127. 10.1016/S0300-483X(99)00198-5.
Arbuckle TE, Lin Z, Mery LS: An exploratory analysis of the effect of pesticide exposure on the risk of spontaneous abortion in an Ontario farm population. Environmental health perspectives. 2001, 109 (8): 851-10.1289/ehp.01109851.
Schüz J, Kaletsch U, Meinert R, Kaatsch P, Michaelis J: Risk of childhood leukemia and parental self-reported occupational exposure to chemicals, dusts, and fumes: results from pooled analyses of German population-based case-control studies. Cancer Epidemiology Biomarkers & Prevention. 2000, 9 (8): 835-
Ou Shu X, Stewart P, Wen WQ, Han D, Potter JD, Buckley JD, Heineman E, Robison LL: Parental occupational exposure to hydrocarbons and risk of acute lymphocytic leukemia in offspring. Cancer Epidemiology Biomarkers & Prevention. 1999, 8 (9): 783-
McKinney PA, Fear NT, Stockton D: Parental occupation at periconception: findings from the United Kingdom Childhood Cancer Study. Occupational and environmental medicine. 2003, 60 (12): 901-10.1136/oem.60.12.901.
Vinceti M, Rovesti S, Bergomi M, Calzolari E, Candela S, Campagna A, Milan M, Vivoli G: Risk of birth defects in a population exposed to environmental lead pollution. Sci Total Environ. 2001, 278 (1-3): 23-30. 10.1016/S0048-9697(00)00885-8.
Lacasaña M, Vázquez-Grameix H, Borja-Aburto VH, Blanco-Muñoz J, Romieu I, Aguilar-Garduño C, García AM: Maternal and paternal occupational exposure to agricultural work and the risk of anencephaly. Occupational and environmental medicine. 2006, 63 (10): 649-10.1136/oem.2005.023333.
Aguilar-Garduño C, Lacasaña M, Blanco-Muñoz J, Borja-Aburto VH, Garcia AM: Parental occupational exposure to organic solvents and anencephaly in Mexico. Occupational and environmental medicine. 2009, 67 (1): 32-
Perin PM, Maluf M, Czeresnia CE, Nicolosi Foltran Januário DA, Nascimento Saldiva PH: Effects of exposure to high levels of particulate air pollution during the follicular phase of the conception cycle on pregnancy outcome in couples undergoing in vitro fertilization and embryo transfer. Fertility and Sterility. 2010, 93 (1): 301-303. 10.1016/j.fertnstert.2009.06.031.
Shaw GM, Todoroff K, Schaffer DM, Selvin S: Periconceptional nutrient intake and risk for neural tube defect-affected pregnancies. Epidemiology. 1999, 10 (6): 711-716. 10.1097/00001648-199911000-00011.
Desrosiers TA, Lawson CC, Meyer RE, Richardson DB, Daniels JL, Waters MA, van Wijngaarden E, Langlois PH, Romitti PA, Correa A: Maternal occupational exposure to organic solvents during early pregnancy and risks of neural tube defects and orofacial clefts. Occup Environ Med. 2012, 69 (7): 493-499. 10.1136/oemed-2011-100245.
Abadi-Korek I, Stark B, Zaizov R, Shaham J: Parental occupational exposure and the risk of acute lymphoblastic leukemia in offspring in Israel. Journal of occupational and environmental medicine. 2006, 48 (2): 165-10.1097/01.jom.0000183343.81485.7c.
Ali R, Yu C, Wu M, Ho C, Pan B, Smith T, Christiani DC: A case-control study of parental occupation, leukemia, and brain tumors in an industrial city in Taiwan. Journal of occupational and environmental medicine. 2004, 46 (9): 985-10.1097/01.jom.0000138913.75380.13.
Infante-Rivard C, Sinnett D: Preconceptional paternal exposure to pesticides and increased risk of childhood leukaemia. Lancet. 1999, 354 (9192): 1819-
Meinert R, Schüz J, Kaletsch U, Kaatsch P, Michaelis J: Leukemia and non-Hodgkin's lymphoma in childhood and exposure to pesticides: results of a register-based case-control study in Germany. American journal of epidemiology. 2000, 151 (7): 639-10.1093/oxfordjournals.aje.a010256.
Van Maele-Fabry G, Lantin AC, Hoet P, Lison D: Childhood leukaemia and parental occupational exposure to pesticides: a systematic review and meta-analysis. Cancer Causes and Control. 2010, 21 (6): 787-809. 10.1007/s10552-010-9516-7.
The publication of these papers and supplement was supported by an unrestricted grant from The Partnership for Maternal, Newborn and Child Health.
This article has been published as part of Reproductive Health Volume 11 Supplement 2, 2014: Preconception interventions. The full contents of the supplement are available online at http://www.reproductive-health-journal.com/supplements/11/S3. Publication charges for this collection were funded by the Partnership for Maternal, Newborn & Child Health (PMNCH).
We do not have any financial or non-financial competing interests for this review.
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Lassi, Z.S., Imam, A.M., Dean, S.V. et al. Preconception care: caffeine, smoking, alcohol, drugs and other environmental chemical/radiation exposure. Reprod Health 11, S6 (2014). https://doi.org/10.1186/1742-4755-11-S3-S6
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