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Table 1 Example for Keywords combinations

From: Effect of attachment-based interventions on prenatal attachment: a protocol for systematic review

Maternal/Paternal And Attachment AND/OR Fetus

Prenatal /Pregnancy AND Attachment

Parental/Expectant Mother/Father AND Attachment

Paternal/Maternal AND Attachment

Maternal/Paternal AND Fetal AND Relation

Prenatal/Pregnancy AND Relationship

Mother/father AND Fetal AND Relation

Mother/Father AND Fetal AND Attachment

Similar phrases and Persian synonyms were also will be used.