Antonio Ragusa1, Denise Rinaldo2, Alessandro Svelato3. 1. Department of Obstetrics and Gynecology, San Giovanni Calibita Fatebenefratelli Hospital Isola Tiberina, Rome, Italy. 2. Department of Obstetrics and Gynecology, Bolognini Hospital, Seriate, Italy. 3. Department of Obstetrics and Gynecology, San Giovanni Calibita Fatebenefratelli Hospital Isola Tiberina, Via di Ponte Quattro Capi, 39, Rome, Italy 00186. Electronic address: alessandrosvelato@virgilio.it.