1. Department of Obstetrics and Gynecology, “Sandro Pertini” Hospital, Rome, Italy
2. Department of Obstetrics and Gynecology, “Tor Vergata” University, Rome, Italy
3. Department of Obstetrics and Gynecology, “Santa Maria Goretti” Hospital, Latina, Italy
4. Department of Obstetrics and Gynecology, “Casilino” Hospital, Rome, Italy