1. Department of Obstetrics and Gynecology Copenhagen University Hospital—Holbæk Holbæk Denmark
2. Department of Obstetrics and Gynecology Copenhagen University Hospital—North Zealand Hillerød Denmark
3. Department of Clinical Medicine University of Copenhagen Copenhagen Denmark
4. OPEN, Odense University Hospital Odense Denmark
5. Department of Obstetrics and Gynecology Copenhagen University Hospital—Bornholm Rønne Denmark
6. Department Obstetrics and Gynecology Hospital of South West Jutland Esbjerg Denmark
7. Department of Obstetrics and Gynecology Copenhagen University Hospital—Herlev and Gentofte Herlev Denmark
8. Department of Obstetrics and Gynecology Gødstrup Hospital Herning Denmark
9. Department of Obstetrics and Gynecology The North Denmark Regional Hospital Hjørring Hjørring Denmark
10. Department of Obstetrics and Gynecology Horsens Regional Hospital Horsens Denmark
11. Department of Obstetrics and Gynecology Copenhagen University Hospital – Amager and Hvidovre Hvidovre Denmark
12. Department Obstetrics and Gynecology University Hospital of Southern Denmark – Kolding Kolding Denmark
13. Department Obstetrics and Gynecology Nykøbing F. Hospital Nykøbing F Denmark
14. Department of Obstetrics and Gynecology Odense University Hospital Odense Denmark
15. Department of Obstetrics and Gynecology Randers Regional Hospital Randers Denmark
16. Department of Obstetrics and Gynecology Copenhagen University Hospital – Rigshospitalet Copenhagen Denmark
17. Department of Obstetrics and Gynecology Zealand University Hospital Roskilde Denmark
18. Department of Obstetrics and Gynecology Copenhagen University Hospital – Næstved Slagelse Denmark
19. Department of Obstetrics and Gynecology Hospital of South Jutland Aabenraa Denmark
20. Department of Obstetrics and Gynecology The North Denmark Regional Hospital Thisted Thisted Denmark
21. Danish Center for Clinical Health Services Research (DACS) Aalborg Denmark
22. Department of Obstetrics and Gynecology Viborg Regional Hospital Viborg Denmark
23. Department of Obstetrics and Gynecology Aarhus University Hospital Aarhus Denmark
24. Department of Obstetrics and Gynecology Aalborg University Hospital Aalborg Denmark
25. Research Unit OPEN, Department of Clinical Research University of Southern Denmark Odense Denmark