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Journal
- american journal of obstetrics and gynecology28
- journal of obstetrics and gynaecology18
- bmc pregnancy and childbirth17
- bmj15
- international journal of gynecology & obstetrics12
- paediatric and perinatal epidemiology11
- bjog: an international journal of obstetrics and gynaecology10
- bmc pediatrics10
- bmc pregnancy & childbirth10