1 Obstetrics and Gynaecology Department, IRCCS San Raffaele Scientific Institute, Milan, Italy.
2 School of Medicine, Vita-Salute San Raffaele University, Milan, Italy.
3 Division of Obstetrics and Prenatal Medicine, Department of Medicine and Surgery, IRCCS Sant'Orsola-Malpighi Hospital, University of Bologna, Bologna, Italy.