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Journal
- american journal of obstetrics and gynecology47
- obstetrics and gynecology34
- maternal and child health journal31
- archives of gynecology and obstetrics25
- acta obstetricia et gynecologica scandinavica20
- cadernos de saude publica20
- journal of perinatal medicine17
- bmc pregnancy and childbirth16
- revista de saude publica16