1. Department of Obstetrics and Gynaecology Amsterdam Reproduction & Development Research Institute Amsterdam UMC University of Amsterdam Amsterdam The Netherlands
2. Department of Obstetrics and Gynaecology Spaarne Gasthuis Hoofddorp The Netherlands
3. Department of Obstetrics and Gynaecology Reinier de Graaf Hospital Delft The Netherlands
4. Department of General Practice/Women's studies Medicine University Medical Centre Radboud Nijmegen The Netherlands
5. Department of Gynaecology Bergman Clinics Amsterdam The Netherlands
6. Department of Obstetrics and Gynaecology UMCU University of Utrecht Utrecht The Netherlands
7. Department of Gynaecology Bergman Clinics Bilthoven The Netherlands