1. Department of Obstetrics and Gynaecology; GROW, School for Oncology and Developmental Biology; Maastricht University Medical Centre+; Maastricht The Netherlands
2. Department of Obstetrics and Gynaecology; Atrium Medical Centre; Heerlen The Netherlands
3. Department of Clinical Epidemiology and Medical Technology Assessment; Maastricht University Medical Centre+; Maastricht The Netherlands
4. Department of Epidemiology; Caphri School for Public Health and Primary Care; Maastricht University Medical Centre+; Maastricht The Netherlands
5. Department of Obstetrics and Gynaecology; University Medical Centre; Utrecht The Netherlands
6. Department of Obstetrics and Gynaecology; Orbis Medical Centre; Sittard The Netherlands
7. Department of Obstetrics and Gynaecology; Hospital Rijnstate; Arnhem The Netherlands
8. Department of Obstetrics and Gynaecology; Catharina Hospital; Eindhoven The Netherlands
9. Department of Obstetrics and Gynaecology; Academic Medical Centre; University of Amsterdam; Amsterdam The Netherlands
10. Midwifery Education and Studies Maastricht-ZUYD; Research Department Midwifery Science; Maastricht The Netherlands
11. Department of Obstetrics and Gynaecology; Onze Lieve Vrouwe Gasthuis; Amsterdam The Netherlands
12. Department of Obstetrics and Gynaecology; Leiden University Medical Centre; Leiden The Netherlands
13. Department of Obstetrics and Gynaecology; VU University Medical Centre; Amsterdam The Netherlands
14. Department of Family Medicine; Caphri School for Public Health and Primary Care Research; Maastricht University Medical Centre+; Maastricht The Netherlands
15. Scientific Institute for Quality of Healthcare (IQ Healthcare); Radboud University Nijmegen Medical Centre; Nijmegen The Netherlands