1. Department of Health Registry Research and Development Norwegian Institute of Public Health Bergen Norway
2. Department of Obstetrics and Gynecology Haukeland University Hospital Bergen Norway
3. Department of Obstetrics and Gynecology Copenhagen University Hospital – Holbæk Holbæk Denmark
4. Department of Clinical Medicine University of Copenhagen Copenhagen Denmark
5. Department of Global Public Health and Primary Care University of Bergen Norway
6. Division of Mental and Physical Health Norwegian Institute of Public Health Norway
7. Department of Obstetrics and Gynecology Sahlgrenska University Hospital Gothenburg Sweden
8. Department of Obstetrics and Gynecology Helsinki University Hospital Helsinki Finland
9. Department of Obstetrics and Gynecology Landspitali University Hospital Reykjavik Iceland
10. Department of Obstetrics and Gynecology Skåne University Hospital Lund Sweden
11. Department of Obstetrics and Gynecology Karolinska University Hospital Stockholm Sweden
12. Norwegian Research Center for Womens’ HealthOslo University Hospital Oslo Norway
13. Institution of Clinical Sciences Department of Obstetrics and Gynecology Lund University Lund Sweden
14. The Finnish Institute of Health and Welfare Helsinki Finland
15. Department of Obstetrics and Gynecology Copenhagen University Hospital – Amager and Hvidovre Copenhagen Denmark