作者单位:Leuven University Hospital, Leuven University Fertility Centre, Herestraat 49, Leuven 3000, Belgium[1]Centre for Health Services and Nursing Research, Catholic University Leuven, Kapucijnenvoer 35[2]Department of Obstetrics and Gynecology, Radboud University Nijmegen Medical Centre, Geert[3]