1. Department of Gynecology and Obstetrics, G. Borea Hospital, Sanremo, Italy.
2. Department of Gynecology and Obstetrics, University of Torino, S. Anna Hospital, Torino, Italy.
3. Department of Gynecology and Obstetrics, SS. Antonio e Biagio e Cesare Arrigo Hospital, Alessandria, Italy.