1. Obstetrics and Gynaecology Department, IRCCS San Raffaele Scientific Institute, Milan, Italy
2. School of Medicine, Vita-Salute San Raffaele University, Milan, Italy
3. Obstetric Unit, IRCCS Azienda Ospedaliero-Universitaria di Bologna, Bologna, Italy
4. Department of Medical and Surgical Sciences (DIMEC), Alma Mater Studiorum, University of Bologna, Bologna, Italy