1. Department of Surgery, Urology Section, University of Catania, Catania, Italy.
2. Department of Urology, University of Florence, Florence, Italy.
3. Urology Section, University of Turin, Molinette Hospital, Turin, Italy.
4. Department of Urology, Martha-Maria Hospital Nuremberg, Nuremberg, Germany.
5. Department of Urology, University of Insubria, Insubria, Italy.
6. Department of Urology, Centro Hospitalar Universitário São João, Porto, Portugal.