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- european journal of obstetrics gynecology and reproductive biology6
- acta obstetricia et gynecologica scandinavica4
- american journal of perinatology3
- bjog an international journal of obstetrics and gynaecology2
- bmc pregnancy and childbirth2
- jmir research protocols2
- journal of maternal fetal neonatal medicine the official journal of the european association of perinatal medicine the federation of asia and oceania perinatal societies the international society of perinatal obstetricians2
- journal of perinatal medicine2
- lancet london england2