1. Department of Obstetrics and Gynaecology Radboud University Medical Center, Radboud Institute for Health Sciences Nijmegen The Netherlands
2. Department of Obstetrics and Gynaecology Rijnstate Hospital Arnhem The Netherlands
3. Department of Clinical Epidemiology and Medical Technology Assessment Maastricht University Medical Centre+ Maastricht The Netherlands
4. Department of Obstetrics and Gynaecology Radboud University Medical Center Nijmegen The Netherlands
5. Department of Obstetrics and Gynaecology Zuyderland Medical Centre Heerlen The Netherlands
6. Department of Obstetrics and Gynaecology Máxima Medical Centre Veldhoven Veldhoven The Netherlands
7. Department of Gynaecology and Obstetrics Isala Zwolle Zwolle The Netherlands