1. Urology Unit, Fondazione PTV Policlinico Tor Vergata, Rome, Italy
2. Department of Urology and Neurourology, BG Unfallkrankenhaus Berlin, Berlin, Germany
3. Department of Urology and Pediatric Urology, University Hospital of Würzburg, Würzburg, Germany
4. Department of Urology, University Hospital of Halle, Martin-Luther University Halle-Wittenberg, Halle, Germany