1 Gynecology and Obstetrics Unit, IRCCS San Raffaele Scientific Institute, Milan, Italy.
2 Department of Gynecology and Obstetrics, Vita-Salute San Raffaele University, Milan, Italy.
3 Division of Obsterics and Prenatal Medicine, Department of Medicine and Surgery (DIMEC), IRCCS Azienda Ospedaliero - Universitaria di Bologna, Bologna, Italy.