1. Department of Urology, Santa Chiara Regional Hospital, 38122 Trento, Italy
2. Institute of Clinical Medicine, University of Oslo, 0313 Oslo, Norway
3. Centro Servizi Sanitari (CST), 38121 Trento, Italy
4. Department of Urology, University of Trieste, 34127 Trieste, Italy
5. Department of Health Science, School of Medicine, University of Catanzaro, 88100 Catanzaro, Italy
6. Department of Urology, University of Naples Federico II, 80138 Naples, Italy
7. Department of Urology, Oslo University Hospital, 0450 Oslo, Norway
8. Institute of Clinical Medicine, University of Aarhus, 8000 Aarhus, Denmark