1. Department of Morphology, Surgery and Experimental Medicine, Section of Obstetrics and Gynaecology, University of Ferrara, S. Anna University Hospital, Cona, Ferrara, Italy;
2. Department of Medical and Surgical Sciences (DIMEC), Division of Obstetrics and Gynaecology, Sant’Orsola - Malpighi Polyclinic, University of Bologna, Bologna, Italy