1. Department of Obstetrics and Gynecology, Hôpital Louis Mourier, Assistance Publique des Hôpitaux de Paris, University Denis Diderot, Colombes, France;
2. Department of Obstetrics and Gynecology, Hôpital Bicêtre, Assistance Publique des Hôpitaux de Paris, University Paris-Sud, Le Kremlin-Bicêtre, France;
3. Department of Obstetrics and Gynecology and Reproductive Medicine, Assistance Publique des Hôpitaux de Paris, Hôpital Antoine Béclère, University Paris-Sud, Clamart, France;
4. Department of Obstetrics and Gynecology, Hôpital Trousseau, Assistance Publique des Hôpitaux de Paris, University Pierre and Marie Curie, Paris, France