1. Department of Urology, University of Cagliari, Santissima Trinità Hospital, Cagliari, Italy.
2. Department of Urology, University of Florence, Careggi Hospital, Florence, Italy.
3. Department of Urology, Hospital Universitario Puerta de Hierro-Majadahonda, Madrid, Spain.
4. Department of Urology, University of Catania, Catania, Italy.