1. U.O.C. Gynecology and Obstetrics, Ospedale San Francesco, Nuoro, Italy,
2. Department of Surgical Sciences, Section of Obstetrics & Gynecology, University of Cagliari, Monserrato, Italy,
3. Casa di Cura Accreditata Fabia Mater, Roma, Italy, and
4. Department of Obstetrics and Gynecology, Perrino Hospital, Brindisi, Italy