Risk factors and adverse pregnancy outcomes among births affected by velamentous umbilical cord insertion: A retrospective population-based register study
作者单位：Savonia University of Applied Sciences, P.O. Box 72, 74101 Iisalmi, Finland[1]Department of Obstetrics and Gynaecology, Kuopio University Hospital, P.O. Box 1777, 70211 Kuopio[2]
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