1. Department of Obstetrics and Gynecology Copenhagen University Hospital‐Holbæk Holbæk Denmark
2. Department of Clinical Medicine University of Copenhagen Copenhagen Denmark
3. Department of Obstetrics and Gynecology Copenhagen University Hospital‐Amager and Hvidovre Hvidovre Denmark
4. OPEN‐Open Patient data Explorative Network Odense University Hospital Odense Denmark
5. Department of Epidemiology Research and Division of Infectious Diseases Preparedness Statens Serum Institut Copenhagen Denmark
6. Department of Obstetrics and Gynecology Copenhagen University Hospital‐Bornholm Rønne Denmark
7. Department Obstetrics and Gynecology Hospital of South West Jutland Esbjerg Denmark
8. Department of Obstetrics and Gynecology Copenhagen University Hospital‐Herlev and Gentofte Herlev Denmark
9. Department Obstetrics and Gynecology Regional Hospital West Jutland Herning Denmark
10. Department of Obstetrics and Gynecology Copenhagen University Hospital‐North Zealand Hillerød Denmark
11. Department of Obstetrics and Gynecology The North Denmark Regional Hospital Hjørring Hjørring Denmark
12. Department of Obstetrics and Gynecology Horsens Regional Hospital Horsens Denmark
13. Department Obstetrics and Gynecology University Hospital of Southern Denmark‐Kolding Kolding Denmark
14. Department Obstetrics and Gynecology Nykøbing F. Hospital Nykøbing F Denmark
15. Department of Obstetrics and Gynecology Odense University Hospital Odense Denmark
16. Department of Obstetrics and Gynecology Randers Regional Hospital Randers Denmark
17. Department of Obstetrics and Gynecology Copenhagen University Hospital‐Rigshospitalet Copenhagen Denmark
18. Department of Obstetrics and Gynecology Zealand University Hospital Roskilde Denmark
19. Department of Obstetrics and Gynecology Copenhagen University Hospital‐Slagelse Slagelse Denmark
20. Department of Obstetrics and Gynecology Hospital of South Jutland Aabenraa Denmark
21. Department of Obstetrics and Gynecology The North Denmark Regional Hospital Thisted Thisted Denmark
22. Danish Center for Clinical Health Services Research (DACS) Aalborg Denmark
23. Department of Obstetrics and Gynecology Viborg Regional Hospital Viborg Denmark
24. Department of Obstetrics and Gynecology Aarhus University Hospital Aarhus Denmark
25. Department of Obstetrics and Gynecology Aalborg University Hospital Aalborg Denmark
26. Department of Clinical Research University of Southern Denmark Odense Denmark