1. Faculty of Medicine, Vrije Universiteit Amsterdam Amsterdam The Netherlands
2. Department of Obstetrics and Gynaecology, Amsterdam Reproduction & Development Research Institute, Amsterdam UMC University of Amsterdam Amsterdam The Netherlands
3. Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht Utrecht University Utrecht The Netherlands
4. Department of Obstetrics and Gynaecology University Medical Center Utrecht Utrecht The Netherlands
5. Department of Obstetrics and Gynaecology Radboud University Nijmegen Medical Center Nijmegen The Netherlands
6. Department of Obstetrics and Gynaecology Amsterdam Reproduction & Development Research Institute, Amsterdam UMC, Vrije Universiteit Amsterdam The Netherlands
7. Department of Obstetrics and Gynaecology Leiden University Medical Center Leiden The Netherlands
8. Department of Obstetrics and Gynaecology Maastricht University Medical Center Maastricht The Netherlands
9. Department of Obstetrics University Medical Center Groningen Groningen The Netherlands
10. Department of Obstetrics and Gynaecology, School of Medicine Monash University Melbourne Victoria Australia
11. Aberdeen Centre for Women's Health Research University of Aberdeen Aberdeen UK