1. Department of Obstetrics and Gynecology, Radboud Institute for Health Sciences Radboud University Medical Center Nijmegen The Netherlands
2. Department of Obstetrics and Gynecology and Catharina Cancer Institute Catharina Hospital Eindhoven The Netherlands
3. Radboud Institute for Health Sciences, Department of IQ health care Radboud University Medical Center Nijmegen The Netherlands
4. Department of Primary and Community Care Radboud University Medical Center Nijmegen The Netherlands
5. Department of Obstetrics and Gynecology Maastricht University Medical Center Maastricht The Netherlands
6. Department of Obstetrics and Gynecology Bernhoven Hospital Uden The Netherlands
7. Department of Obstetrics and Gynecology Rijnstate Hospital Arnhem The Netherlands
8. Department of Obstetrics and Gynecology Elkerliek Hospital Helmond The Netherlands
9. Department for Health Evidence, Radboud Institute for Health Sciences Radboud University Medical Center Nijmegen The Netherlands