1. Clinical Epidemiology Division Department of Medicine, Solna, Karolinska Institutet Stockholm Sweden
2. Department of Obstetrics and Gynecology, Visby County Hospital Visby Sweden
3. Center for Fertility and Health, Norwegian Institute of Public Health Oslo Norway
4. Department of Obstetrics and Gynecology Copenhagen University Hospital‐Holbæk Holbæk Denmark
5. Department of Clinical Medicine University of Copenhagen Copenhagen Denmark
6. Department of Obstetrics and Gynecology Copenhagen University Hospital–Northzealand‐Hillerød Hillerød Denmark
7. Department of Public Health University of Copenhagen Copenhagen Denmark
8. Statistics Denmark Copenhagen Denmark
9. Department of Obstetrics and Gynecology Copenhagen University Hospital–Hvidovre Hvidovre Denmark
10. Department of Clinical Science Intervention and Technology Karolinska Institutet Stockholm Sweden
11. Division of Women's Health Karolinska University Hospital Stockholm Sweden