1. Department of Human Genetics, Radboud University Medical Centre, P.O. Box 9101, 6500 HB Nijmegen, The Netherlands
2. Department of Obstetrics and Gynaecology, Rijnstate Hospital, 6815 AD Arnhem, The Netherlands
3. Department of Obstetrics and Gynaecology, Jeroen Bosch Hospital, 5200 ME ‘s-Hertogenbosch, The Netherlands
4. Department of Obstetrics and Gynaecology, Medical Spectrum Twente, 7500 KA Enschede, The Netherlands
5. Department of Obstetrics and Gynaecology, St. Elisabeth Hospital, 5022 GC Tilburg, The Netherlands
6. Department of Obstetrics and Gynaecology, Radboud University Medical Centre, 6500 HB Nijmegen, The Netherlands