1. Department of Obstetrics and Gynecology; Academic Medical Center; Amsterdam the Netherlands
2. University of Liverpool; Liverpool Women's Hospital; Liverpool UK
3. University of Toronto; Sunnybrook & Women's Health Sciences Centre; Toronto ON Canada
4. Department of Obstetrics and Gynecology; University of Alabama at Birmingham; Birmingham AL USA
5. Department of Obstetrics and Gynecology; Hospital of the University of Pennsylvania; Philadelphia PA USA
6. Christiana Care Health System; Newark DE USA
7. University of Kansas Medical Center; Kansas City MO USA
8. The Robinson Research Institute; School of Paediatrics and Reproductive Health; University of Adelaide; Adelaide SA Australia
9. Department of Obstetrics and Gynecology; UNICAMP; Campinas Brazil
10. University of Texas Medical Branch Hospitals; Galveston TX USA
11. Department of Obstetrics and Gynaecology; King's College; London UK
12. CHU Toulouse Hôpital Paule de Viguier; Université Toulouse; Toulouse France
13. Women's Health Research Unit; The Blizard Institute; Barts and the London School of Medicine and Dentistry; London UK