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Journal
- american journal of obstetrics and gynecology312
- international journal of gynecology & obstetrics110
- acta obstetricia et gynecologica scandinavica109
- journal of maternal-fetal & neonatal medicine104
- american journal of perinatology74
- archives of gynecology and obstetrics64
- bmc pregnancy and childbirth61
- journal of perinatal medicine57
- journal of obstetrics & gynaecology research56