1. Department of Obstetrics and Gynecology, “Perrino” Hospital, Brindisi, Italy;
2. Department of Obstetrics and Gynecology, “Caberlingo” Hospital, Brindisi, Italy;
3. Department of Obstetrics and Gynecology, University Medical School Novara, Italy;
4. Department of Obstetrics and Gynecology, University Medical School “A. Moro”, Bari, Italy;
5. Department of Obstetrics and Gynecology, University Medical School, Cagliari, Italy