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Journal
- trials17
- bjog: an international journal of obstetrics and gynaecology9
- bjog: an international journal of obstetrics & gynaecology8
- international journal of technology assessment in health care8
- obstetrical & gynecological survey7
- cochrane database of systematic reviews6
- journal of clinical epidemiology5
- nephrology dialysis transplantation5
- bmj: british medical journal4