Affiliation: | (1) Department of Obstetrics and Gynaecology, Reinier de Graaf Group, P.O. Box 5011, 2600, GA, Delft, The Netherlands;(2) Department of Obstetrics and Gynaecology, Radboud University Nijmegen Medical Centre, P.O. Box 9101, 6500, HB, Nijmegen, The Netherlands |