1. Department of Urology, Santa Chiara Hospital, 38122 Trento, Italy
2. Institute of Clinical Medicine, University of Oslo, 0313 Oslo, Norway
3. Department of Urology, University of Naples, Federico II, 80138 Naples, Italy
4. Department of Urology, University of Turin, 10124 Turin, Italy
5. Department of Urology, University of Salerno, 84084 Salerno, Italy