1. Radboud University Nijmegen; Faculty of Medical School; Geert Grooteplein 9 PO Box 9101 Nijmegen Netherlands 6500HB
2. Radboud University Nijmegen Medical Center; Department of Obstetrics and Gynaecology; PO Box 9101 Nijmegen Netherlands 6500 HB
3. Radboud University Nijmegen Medical Centre; Nijmegen Netherlands
4. University of Auckland; Department of Obstetrics and Gynaecology; FMHS Park Road Grafton Auckland New Zealand 1003