1. Department of Obstetrics and GynecologyHôpital Bicêtre, Assistance Publique Hôpitaux de Paris (APHP) 94275 Le Kremlin‐Bicêtre France
2. Faculté de Médecine Paris‐SudUniversité Paris‐Sud 94276 Le Kremlin‐Bicêtre France
3. INSERM, CESP Centre for Research in Epidemiology and Population HealthU1018, Reproduction and Child Development Villejuif France