1. Department of Obstetrics and Gynecology; Bordeaux University Hospital; Bordeaux France
2. Department of Obstetrics and Gynecology; Trousseau Hospital AP-HP; Paris France
3. Department of Obstetrics and Gynecology; St George's University Hospitals NHS Foundation Trust; London UK
4. Department of Obstetrics and Gynecology; CEMIC University Hospital; Buenos Aires Argentina
5. EGA Institute for Women's Health; Faculty of Population Health Sciences; University College London; London UK