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Journal
- bjog: an international journal of obstetrics & gynaecology42
- paediatric and perinatal epidemiology40
- pediatrics40
- american journal of epidemiology31
- journal of pediatrics26
- cochrane database of systematic reviews24
- international journal of epidemiology22
- american journal of obstetrics and gynecology20
- bjog an international journal of obstetrics and gynaecology20