1. EPI‐Centre KU Leuven Leuven Belgium
2. Nuffield Department of Primary Care Health Sciences University of Oxford Oxford UK
3. Department of Development and Regeneration KU Leuven Leuven Belgium
4. Department of Obstetrics and Gynecology University Hospitals Leuven Leuven Belgium
5. Department of Epidemiology CAPHRI Care and Public Health Research Institute Maastricht University Maastricht The Netherlands
6. Department of Clinical Science and Education Karolinska Institutet Solna Sweden
7. Department of Obstetrics and Gynecology Södersjukhuset Stockholm Sweden
8. Department of Obstetrics, Gynecology and Reproduction Hospital Universitario Dexeus Barcelona Spain
9. Department of Obstetrics and Gynecology Clinical Sciences Institute Luigi Sacco Milan Italy
10. Department of Obstetrics and Gynecology Skåne University Hospital, Lund University Malmö Sweden
11. Department of Obstetrics and Gynecology Clinica Universidad de Navarra, School of Medicine Pamplona Spain
12. Department of Obstetrics and Gynecology Brugmann University Hospital Brussels Belgium
13. Clinic of Obstetrics and Gynecology Department of Medicine and Surgery San Gerardo Hospital, University of Milan‐Bicocca Monza Italy
14. Department of Obstetrics and Gynaecology Queen Charlotte's and Chelsea Hospital Imperial College London London UK
15. Department of Biomedical Data Sciences Leiden University Medical Cenete Leiden The Netherlands