1. Obstetrics and Gynaecology Unit, Vita-Salute San Raffaele University and IRRCS San Raffaele Hospital, Milan - Italy
2. Department of Obstetrics and Gynaecology, IRCCS San Martino Hospital and National Institute for Cancer Research, University of Genoa, Genoa - Italy
3. Department of Surgical and Morphological Sciences, University of Insubria, Varese - Italy