1. Department of Obstetrics, Necker Hospital; Universite Paris Descartes; Paris France
2. Department of Obstetrics and Gynecology; University of Tours; Tours France
3. Department of Obstetrics, Jeanne de Flandre Hospital; Lille University; Lille France
4. Department of Obstetrics and Gynecology; Hôpital Antoine Béclère; Clamart France