1. Department of Obstetrics and Gynecology, Hôpital Bichat, 46, rue Henri-Huchard, 75018 Paris, France
2. Department of Obstetrics and Gynecology, Hôpital Tenon, Paris, 4, rue de la Chine, 75020 Paris, France
3. Department of Obstetrics and Gynecology, Hôpital Pitié, 47-83 boulevard de l'Hôpital, 75013 Paris, France