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Health workers' attitudes toward sexual and reproductive health services for unmarried adolescents in Ethiopia
© Tilahun et al.; licensee BioMed Central Ltd. 2012
Received: 24 April 2012
Accepted: 27 August 2012
Published: 3 September 2012
Adolescents in developing countries face a range of sexual and reproductive health problems. Lack of health care service for reproductive health or difficulty in accessing them are among them. In this study we aimed to examine health care workers' attitudes toward sexual and reproductive health services to unmarried adolescents in Ethiopia.
We conducted a descriptive cross-sectional survey among 423 health care service providers working in eastern Ethiopia in 2010. A pre-tested structured questionnaire was used to collect data. Descriptive statistics, chi-square tests and logistic regression were performed to drive proportions and associations.
The majority of health workers had positive attitudes. However, nearly one third (30%) of health care workers had negative attitudes toward providing RH services to unmarried adolescents. Close to half (46.5%) of the respondents had unfavorable responses toward providing family planning to unmarried adolescents. About 13% of health workers agreed to setting up penal rules and regulations against adolescents that practice pre-marital sexual intercourse. The multivariate analysis indicated that being married (OR 2.15; 95% CI 1.44 - 3.06), lower education level (OR 1.45; 95% CI 1.04 - 1.99), being a health extension worker (OR 2.49; 95% CI 1.43 - 4.35), lack of training on reproductive health services (OR 5.27; 95% CI 1.51 - 5.89) to be significantly associated with negative attitudes toward provision of sexual and reproductive services to adolescents.
The majority of the health workers had generally positive attitudes toward sexual and reproductive health to adolescents. However, a minority has displayed negatives attitudes. Such negative attitudes will be barriers to service utilization by adolescents and hampers the efforts to reduce sexually transmitted infections and unwanted pregnancies among unmarried adolescents. We therefore call for a targeted effort toward alleviating negative attitudes toward adolescent-friendly reproductive health service and re-enforcing the positive ones.
According to World Health Organization (WHO) definition adolescent comprises individuals between the age group of 10–19 years. It is the period of transition from childhood to adulthood characterized by significant physiological, psychological and social changes[1, 2].
Adolescents suffer from life threatening health risks related to early marriage, unwanted pregnancies, unsafe abortions, sexually transmitted infections (STIs) including HIV/AIDS, female genital mutilation, malnutrition and anemia, infertility, sexual and gender based violence, and other serious reproductive health and social problems. Many adolescents die prematurely. An estimated 70,000 teenage girls die every year during pregnancy and childbirth and more than one million infants born to adolescent girls die before their first birthday[3–6].
An estimated 14 million adolescents give birth globally each year and more than 90% of these live births occur in developing countries. Adolescents in the Sub-Saharan Africa region have low family planning utilization rates and limited knowledge of reproductive health (RH) services. They account for a higher proportion of the region’s new HIV infections, maternal mortality, and unmet need for reproductive health information and services which is linked to social, cultural, economic and gender related factors[4, 7].
The literatures shows that adolescents often lack basic RH information, knowledge, experience, and are less comfortable accessing reproductive and sexual health services than adults. This could be attributed to parents, health care workers, and educators who are frequently unwilling or unable to provide age-appropriate RH information to young people. This is often due to their discomfort about the subject or the false belief that providing the information will encourage sexual activity. Adolescents’ embarrassment or discomfort to discuss sensitive topics with their health care provider, less favorable attitudes toward the use of health services and providers, disappointment with how health care providers questions, uncertainty on what providers do with information, and being treated disrespectfully and even denial of the service by their health care providers are often cited as discouraging[4, 7, 9].
In Ethiopia, youth commonly suffer from reproductive health problems such as sexual coercion, early marriage, female genital cutting, and sexually transmitted infections. According to the 2011 EDHS, 28.6% of the married women were using family planning method. The coverage is only 23.8% among adolescents’ of 15–19 years of age. Unmet need for family planning in Ethiopia in the same year was 25% and it is highest among adolescents of 15–19 years of age. Although the government provides contraception at no cost, these supplies are frequently not readily accessible. Childbearing also begins early, with 45% of total births in the country occurring among adolescent girls and young women[10–12].
Reports indicate that demand for sexual and reproductive health services by adolescents is increasing in developing countries[13–15]. However, there is limited evidence on the provision of the service, its effectiveness, and the role of the different stakeholders involved[13, 14]. Integrated services delivered through the healthcare system are identified as one of the most effective ways of delivering RH services. Health professional are responsible to promote and provide the sexual and reproductive health service to adolescents in health facilities. The evidence in many countries has shown that most young people do not routinely seek sexual and reproductive health service. The role of health professionals as a source of information is found to be low. In order to provide the service it is imperative that providers themselves should have positive attitude towards the service. Little is known about health workers attitude towards sexual and reproductive health services for unmarried adolescents in Ethiopia. The study will give insight about health care workers’ attitudes toward adolescent sexual and reproductive health and could be helpful to design appropriate intervention measures to improve adolescent sexual and reproductive health in the country.
Settings and study design
Ethiopian health care institutions are structured according to the World Health Organization’s recommendation for primary health care and consist of community health centers and hospitals with governmental and private ownership. The institutions included in this study provide service to more than 3 million people residing in urban and rural areas. Contraception including primarily, pills, injection, emergency contraception and counseling services are provided for clients. Services like intra-uterine devices, Norplant and tubal ligation are provided at the higher centers like hospitals. There are no specialized family planning workers in Ethiopia. Instead, and as seen practically in our study area, all health care workers are responsible for working on RH services department of the health institutions. Mostly they work in rotations that may range from a month to a year.
We conducted a cross-sectional survey among 423 (15.5%) of the 1704 health workers working in two hospitals and 83 health centers in eastern Hararghe, Ethiopia (Oromia region) using a stratified proportional sampling procedure in which samples were drawn from each health institution in proportion to the number of health workers at the time of the study. The sample size was calculated using the formula for estimation of a single proportion, n = z2*p(1-p)/r2. Where the z value is taken as 1.96; p, proportion of positive attitudes, was assumed to be 50%; and r, the margin of error of estimation, was assumed to be 5% or 0.05. This provided a sample size of 384. To account for non-response 10% was added, providing a sample size of 423. All health care personnel including physicians, nurses and health assistants, working in the institutions and directly involved in day-to-day patient care and services were included in the study. The researchers reached participants through their respective institution and department heads. Data collection took place from August to October, 2010.
Questionnaire and data collection
Data were collected using a self-administered structured questionnaire provided to respondents at their respective health institutions. It was developed after reviewing qualitative and quantitative research in the area of family planning and adolescent reproductive health. Final items were generated after discussion among the researchers. After consensus, the items were checked for clarity and translated into the local language of Oromiffa. The resulting questionnaire was pretested on a convenience sample of 20 health workers that were not included in the study and corrections were made afterwards. The final questionnaire contained items on basic demographic information such as age and sex; and perception and attitudes toward adolescent sexual and reproductive health. Most of the attitude questions were rated into three responses - agree, disagree, and neutral.
Questionnaires were checked for completeness and consistency and then entered into EPI INFO software version 3.5.1, corrected and cleaned. The data were then transferred to IBM® SPSS® Statistics, version 16 for Windows for analysis. Chi-square tests and simultaneous entry multivariable logistic regression were performed to examine associations. Unadjusted and adjusted (AOR) odds ratios were used as indicators of the strength of association. In the analysis a conservative approach was followed in which disagreement and neutral attitude were merged together. The cut-off level for alpha was set at 0.05.
In this study adolescent refers to young persons of both sexes in the age interval of 11 to 19. Furthermore they must not be in a union which has acceptance by the community or is considered a legal marriage. Health workers refers to a health professional working in the study area at the time of data collection and having certification to work in health service institutions in direct care of patients including provision of family planning or related reproductive health services.
The Institutional Research Ethics Review Committee of Haramaya University provided ethical approval. The health workers were provided information about the study and its importance, and confidentiality of the information requested. Written consent was then obtained from participants in a form provided with the study questionnaire.
Out of the total 423 health workers contacted for interviews, 401 (94.8%) respondents gave responses. Seven questionnaires with incomplete and inconsistent responses were excluded. The analysis was conducted on information collected from the remaining 394 (93.1%) participants.
Characteristics of respondents
Socio-demographic characteristics of the studied subjects, east Hararghe, Ethiopia §
Characteristics of respondents
Age (in years)
36 and above
Diploma and above
< 10 years
> 20 years
Attitudes of the HCWs
The majority of health workers had positive attitudes toward providing sexual and reproductive health services to unmarried adolescents; however, a significant minority had negative attitudes. One hundred twenty one (30.7%) respondents showed unfavorable attitudes toward providing sexual and reproductive health services (RH) for adolescents. Seventy one health workers (19%) disagreed with expanding the services beyond the health facilities where it is convenient to access a large number of adolescents. Fifty (12.7%) disagreed with the capability of health workers to improve the reproductive health needs of adolescents, whereas 190 (48.2%) believed in options other than reproductive health services to solve the problem. One of the options included punishing adolescents that practice premarital sexual intercourse. Almost half disagreed in accepting the importance of the services to prevent unwanted pregnancy. Also 181 (46.5%) gave unfavorable responses when asked to express their preference to provide family planning (FP) services to adolescents. About 13% argued to set up and apply penal rules and regulations against pre-marital sex practicing adolescents, and 18% believed in strict control of the adolescents, especially toward females. Two hundred fourteen (54.1%) said that they would have negative attitudes towards their own daughters or close female relatives if they came across the information that they were using family planning methods. When compared with the same case for males, 40% showed disapproval. Two hundred twenty eight (57.9%) respondents reported that they have never used family planning services themselves; about ninety seven of these (24.6%) were in marital union.
Responses of health care workers concerning sexual and reproductive health services for adolescents, east Hararghe, Ethiopia ¥
Items assessing health workers' attitudes
Positive, n (%)
Neutral, n (%)
Negative, n (%)
Intention on SRHS expansion for UAs
Health workers’ importance in reducing ASRH problems
SRHS expansion is crucial issue for female UAs
Adolescents’ active participation is important in reducing SRH related problems of the premarital adolescents
Discussion between parents and UAs on SRH is mandatory to reduce and control SRH problems of the UAs
Awareness creation to UAs about skills of practicing safe sex negotiation is one step to reduce UASRH problems
UAs have harder time to get SRHS than married clients
UASRHS is important only for female adolescents b/c they are the only victims of the SRH problems
Sex education is better to be started at pre-adolescence age
ASRH service expansion beyond health facilities such as schools and youth centers where a large number of adolescents can be addressed helps to reduce the problem.
ASRH service expansion is an effective way to prevent unwanted pregnancy and its adverse consequences
Adolescents have a right to use FP as that of all other married clients
Pre-marital unsafe abortion cases should not blamed as guilty or the responsible persons for the problem
The way respondents feel towards their adolescent daughters’ contraceptive usage.
The way respondents feel towards their adolescent sons’ contraceptive usage.
The way respondents expect about their spouse’s perception on their adolescent daughter’s contraceptive method usage.
Respondents’ likely to provide FP and other SRH services for every adolescents in future.
Predictors of negative attitudes toward adolescent sexual and reproductive health
Studied health workers’ attitude towards sexual and reproductive health services for adolescents, by their selected characteristics, east Hararghe, Ethiopia, 2010
Unadjusted OR (95% CI)
Adjusted OR (95% CI)
0.50 (0.30 - 0.84)*
0.89 (0.54 - 1.27)
0.80 (0.39 - 1.62)
1.02 (0.72 - 1.43)
1.05 (0.30 - 3.71)
0.56 (0.30 - 1.03)
0.75 (0.46 - 1.23)
0.71 (0.42 - 1.23)
9.15 (4.82 - 17.38)*
2.15 (1.44 - 3.06)
8.47 (3.57 - 20.11)*
1.45 (1.04 - 1.99)
4.99 (1.94 - 12.84)*
2.06 (1.20 - 3.56)
0.65 (0.41 - 1.03)
0.86 (0.54 - 1.37)
0.76 (0.34 - 1.66)
0.84 (0.59 - 1.23)
Health extension workers
2.67 (1.57 - 4.55)*
2.49 (1.43 - 4.35)
2.20 (0.80 - 6.10)
0.86 (0.61 - 1.23)
0.88 (0.23 - 3.31)
1.68 (1.04 - 2.67)
Specific training on RH services
4.17 (2.60 - 6.71)*
5.27 (1.51 - 5. 89)
Service time in years
2.49 (1.38 - 4.47)*
1.07 (1.10- 1.45)
3.35 (0.88 - 12.74)
0.77 (0.50 - 1.10)
Involvement in RH provision
1.03 (0.72 - 2.36)
1.09 (0.79 - 1.47)
Family planning utilization status
2.18 (1.38 - 3.44)*
1.77 (1.05 - 2.77)
Young people make up an important section of the population of developing countries. All over Africa, young people are increasingly practicing pre-marital sexual intercourse. In some countries like Gabon up to 63% of females and 77% of males aged 15–19 have had premarital sexual intercourse. However, the proportion that used condom in the last sexual intercourse was 19% for females and 37% for males. According to the 2011 Ethiopia Demographic and Health Survey, among never married young persons of 15–24 years, about 12.7% of males and 5.6% of females have had sexual intercourse. Among those with a history of sexual intercourse, half of the young men and one third of the young women reported to have used a condom in their recent sexual activity. As a consequence of this, adolescents are vulnerable to a range of reproductive health problems, which run the gamut from sexually transmitted infections such as HIV/AIDS to unwanted pregnancy and unsafe abortions. However, reports indicate that several barriers are faced by adolescents in accessing health services and that more research is needed is needed in this area. This study aimed to examine health care workers (HCWs) attitudes toward provision of sexual and reproductive health (RH) services to unmarried adolescents.
The findings indicate there is positive attitude by the majority of health care workers in eastern Ethiopia, toward provision of RH services to unmarried adolescents. However a significant minority have reported a negative attitude. About 13% agreed to setting up penal rules and regulations against adolescents that practice pre-marital sexual intercourse. On the other hand, 30.7% of respondents had negative attitudes toward providing RH services to unmarried adolescents. Close to half (46.5%) of the respondents had unfavorable responses toward providing family planning to unmarried adolescents. About one third (30.5%) of the respondents had either negative or neutral attitude toward health education activities to create awareness about safe sex.
A study from China indicated that health care workers are ambivalent about providing sexual and reproductive health services to adolescents. Similar to our findings, about half of the respondents in the Chinese sample responded positively to providing family planning to unmarried adolescents. However, unlike the sample in the current study, they had an overwhelmingly positive (92%) response toward health education, arguing for a more in-depth and explicit information about sexuality. In the same manner, more than 80% of the respondents indicated that they could provide counseling about sex and contraception to those who seek their services. There seems to be an ambivalent attitude among the sample of participants in this study and the Chinese samples. However, in comparison, the participants of this study seem to have a more negative attitude toward RH services and adolescents who use them. This could be because the Chinese study included specialized workforce that works on family planning, where as our study included HCWs with varying training and skills level. On top of this, there may be higher awareness in China on the use of contraceptives through the one child policy. This may imply a need for more training and awareness creation among the health care workers in Ethiopia so as to enhance their existing soft skills toward client interaction and attitudes toward reproductive health services to adolescents.
A review by Tylee and colleagues indicates that adolescents fear scolding by health workers and lack of confidentiality. Health workers may also not have the necessary trainings for effective communication with adolescents. In these situations adolescents were shown to seek help from close friends and siblings and in health institutions far from home. They may also be liable to seek the services of illegal health service providers such as illegal abortions, putting themselves at significant risk. In our study area there are no facilities for school health services nor are there, to our knowledge, efforts at encouraging adolescents to seek sexual and reproductive health services in nearby institutions.
The findings of this study imply that there is a poor level of sexual and reproductive health services for unmarried adolescents in the study area when evaluated in the context of the negative attitudes by health workers. A lot has to be done to address this gap. The services should encompass all aspects of an all rounded reproductive health service including sexual education and easily accessible facilities and supportive health workers. Efforts at tackling the spread of HIV/AIDS should also incorporate reproductive health services. Importantly, there is a need for awareness creation trainings among health workers. According to an intervention aimed at increasing service use by adolescents in Lusaka Zambia by MMari and colleagues, institutions of adolescent friendly services increases service utilization even though not as much as expected. The importance of implementing parental and community mobilization on top of improvements in health care system related factors are also emphasized[24–27].
This study has limitations. Even though HCWs had privacy during administration of the questionnaires, the possibility of social desirability bias could not be excluded. Due to this possibility of under-reporting, we did not examine their practice with regard to providing RH services to adolescents. However, the study has strengths in that it taps into an important research gap in many developing countries. Furthermore we examined a diverse group of health service providers relevant to the setting of a resource poor country.
In conclusion, the majority of the health workers in this study had a positive attitude toward provision of sexual and reproductive health services to unmarried adolescents. However, a minority of them displayed negative attitudes. This is a significant barrier to service utilization by adolescents and hampers the efforts by the government and NGOs to reduce sexually transmitted infections and unwanted pregnancies among unmarried adolescents. We call for a concerted effort toward creating an adolescent-friendly reproductive health service and awareness creation and client handling trainings to health care workers to re-enforce positive attitudes and reduce negative ones. This endeavor should also include adolescents as well as policy makers.
MT holds an MPH degree and is a senior public health practitioner at Kersa district health bureau. BM and GE are lecturers and final year PhD candidates in public health at Haramaya University in Ethiopia, their research interests include adolescent, and child and maternal health. AAR worked with Haramaya University in Ethiopia as a lecturer and has involved in surveys, meta-analyses, trials and other large longitudinal studies; he holds degrees in public health and epidemiology and is a PhD candidate in Demography at Brown University, USA; his research interests include HIV/AIDs, adolescent, child and maternal health, and demography.
We thank research participants, data collectors, and zonal and district level officials for their kind cooperation and involvement in the study. We also thank the following individuals for their valuable contribution: Dr Thomas R Syre, Dr Nega Assefa, Nega Baraki, Zerihun Gashaw, Gedamnesh Desta.Theodros Kasahun, Petros Tafese, Amedin Usman, Demeke Bekele, Fuad Yusuf, Abdurehman Ahmed, and Alemayehu Keberku. Last but not least, we kindly appreciate the funding and administrative support we obtained from Haramaya University, and the East Hararge Zonal Health Office and Kersa Woreda Health Bureau.
- Programming for adolescent health and development: Report of a WHO/UNFPA/UNICEF study group.http://www.who.int/maternal_child_adolescent/documents/trs_886/en/index.html,
- Patton GC, Viner R: Pubertal transitions in health. Lancet. 2007, 369: 1130-1139. 10.1016/S0140-6736(07)60366-3.View ArticlePubMedGoogle Scholar
- McDevitt TM, Adlakha A, Fowler BT, Harris-Bourne V: Trends in Adolescent Fertility and Contraceptive Use in the Developing World. 1996, Washington, DC: US Bureau of the CensusGoogle Scholar
- Stella N, Nakanyike M, Richard K: Adolescent Sexual and Reproductive Health in Uganda: A Sysnthesis of Research Evidence. 2004, New York and Washington: Alan Guttmacher InstituteGoogle Scholar
- Rashid SF: Human rights and reproductive health: political realities and pragmatic choices for married adolescent women living in urban slums, Bangladesh. BMC International Health and Human Rights. 2011, 11 (Suppl 3): S3-10.1186/1472-698X-11-S3-S3.View ArticlePubMedPubMed CentralGoogle Scholar
- Paul VK, Sachdev HS, Mavalankar D, Ramachandran P, Sankar MJ, Bhandari N, Sreenivas V, Sundararaman T, Govil D, Osrin D: Reproductive health, and child health and nutrition in India: meeting the challenge. Lancet. 2011, 377 (9762): 332-349. 10.1016/S0140-6736(10)61492-4.View ArticlePubMedPubMed CentralGoogle Scholar
- World Population Data Sheet: 2009,http://www.prb.org/Publications/Datasheets/2009/2009wpds.aspx,
- McCauley AP, Salter C: Meeting the needs of young adults. Population Reports. 1995, 41: 1-43.PubMedGoogle Scholar
- Sibanda A, Woubalem Z, Hogan DP, Lindstrom DP: The proximate determinants of the decline to below-replacement fertility in Addis Ababa, Ethiopia. Stud Fam Plann. 2003, 34 (1): 1-7. 10.1111/j.1728-4465.2003.00001.x.View ArticlePubMedGoogle Scholar
- CSA, ORC Macro: Ethiopian Demographic and Health Survey 2011. 2011, Addis Ababa: Central Statistical Authority of Ethiopia and Ministry of HealthGoogle Scholar
- Federal Ministry of Health: Ethiopia National Reproductive Health Strategy 2006–2015. Edited by: Health F. 2006, Addis Ababa: Federal Democratic Republic of Ethiopia, Ministry of HealthGoogle Scholar
- Scholl ED, Schueller J, Gashaw M, Wagaw A: Wolde Michael L: Assessment of youth reproductive health programs in ethiopia. 2004, Addis Ababa: Family Health InternationalGoogle Scholar
- Hughes J, McCauley AP: Improving the fit: adolescents' needs and future programs for sexual and reproductive health in developing countries. Stud Fam Plann. 1998, 29 (2): 233-245. 10.2307/172161.View ArticlePubMedGoogle Scholar
- Cleland J, Conde-Agudelo A, Peterson H, Ross J, Tsui A: Contraception and health Prof John Cleland MA a Corresponding AuthorEmail Address, Agustin Conde-Agudelo MD b, Prof Herbert Peterson MD c d, John Ross PhD e, Prof Amy Tsui PhD f. Lancet. 2012, 380 (9837): 149-156. 10.1016/S0140-6736(12)60609-6.View ArticlePubMedGoogle Scholar
- Blanc AK, Tsui AO, Croft TN, Trevitt JL: Patterns and trends in adolescents' contraceptive use and discontinuation in developing countries and comparisons with adult women. Int Perspect Sex Reprod Health. 2009, 35 (2): 63-71. 10.1363/3506309.View ArticlePubMedGoogle Scholar
- Tylee A, Haller DM, Graham T, Churchill R, Sanci LA: Youth-friendly primary-care services: how are we doing and what more needs to be done?. Lancet. 2007, 369: 1565-1573. 10.1016/S0140-6736(07)60371-7.View ArticlePubMedGoogle Scholar
- Agampodi SB, Agampodi TC, Piyaseeli KD: Adolescents perception of reproductive health care services in Sri Lanka. BMC Health Serv Res. 2008, 8: 98-10.1186/1472-6963-8-98.View ArticlePubMedPubMed CentralGoogle Scholar
- Kloos H: Primary health care in Ethiopia under three political systems: community participation in a war torn society. Soc Sci Med. 1998, 46 (4–5): 505-522.View ArticlePubMedGoogle Scholar
- Ministry of Health: Health and Related Indicator. 2009, Addis Ababa: Federal Ministry of Health, EthiopiaGoogle Scholar
- Kelsey JL, Whittemore AS, Evans AS, Thompson WD: Methods of sampling and estimation of sample size. Methods in observational epidemiology. Edited by: Kelsey JL, Whittemore AS, Evans AS, Thompson WD. 1996, New York and Oxford: Oxford University Press, 311-340.Google Scholar
- Bearinger LH, Sieving RE, Ferguson J, Sharma V: Global perspectives on the sexual and reproductive health of adolescents: patterns, prevention, and potential. Lancet. 2007, 369 (9568): 1220-1231. 10.1016/S0140-6736(07)60367-5.View ArticlePubMedGoogle Scholar
- Nugent R: Youth in a global world. 2006, Washington, DC: Population Reference BureauGoogle Scholar
- Tu X, Cui N, Lou C, Gao E: Do family-planning workers in China support provision of sexual and reproductive health services to unmarried young people?. Bull World Health Organ. 2004, 82 (4): 274-280.PubMedPubMed CentralGoogle Scholar
- MMari KN, Magnani RJ: Does making clinic-based reproductive health services more youth-friendly increase service use by adolescents? Evidence from Lusaka, Zambia. J Adolesc Health. 2003, 33: 259-270. 10.1016/S1054-139X(03)00062-4.View ArticlePubMedGoogle Scholar
- Bastien S, Kajula LJ, Muhwezi WW: A review of studies of parent–child communication about sexuality and HIV/AIDS in sub-Saharan Africa. Reprod Heal. 2011, 8: 25-10.1186/1742-4755-8-25.View ArticleGoogle Scholar
- Kesterton AJ, de Mello MC: Generating demand and community support for sexual and reproductive health services for young people: a review of the Literature and Programs. Reprod Heal. 2010, 7: 25-10.1186/1742-4755-7-25.View ArticleGoogle Scholar
- Davis KC, Blitstein JL, Evans WD, Kamyab K: Impact of a parent–child sexual communication campaign: results from a controlled efficacy trial of parents. Reprod Heal. 2010, 7: 17-10.1186/1742-4755-7-17.View ArticleGoogle Scholar
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