Affiliation: | (1) Department of Obstetrics and Gynaecology, University Hospital Nijmegen, P.O. Box 9101, 6500 HB Nijmegen, the Netherlands;(2) Department of Obstetrics and Gynaecology, University Hospital Leiden, P.O. Box 9600, 2300 RC Leiden, the Netherlands;(3) Department of Obstetrics and Gynaecology, Catharina Hospital Eindhoven, Michelangelolaan 2, 5623 EJ Eindhoven, the Netherlands |