1. Department of Women and Child Health, Women Health Area, Fondazione Policlinico Universitario Agostino Gemelli IRCCS, Rome, Italy
2. Unit of Obstetrics and Gynecology, Catholic University of the Sacred Heart, Rome, Italy
3. Department of Obstetrics and Gynaecology, University Hospital Brugmann, Université Libre de Bruxelles, Brussels, Belgium