1. Department of Urology, Careggi Hospital, University of Florence, Florence, Italy.
2. Assisted Reproductive Technology Centre, Careggi Hospital, University of Florence, Florence, Italy.
3. Department of Urology, Vittorio Emanuele II, University of Catania, Catania, Italy.
4. Department of Urology, Santa Chiara Regional Hospital, Trento, Italy.
5. Department of Obstetrics and Gynecology, Santa Chiara Hospital, University of Pisa, Pisa, Italy.