1. Centro Chirurgico Toscano, Arezzo, Italy
2. Clinic and Policlinic for Urology, University of Cologne, Cologne, Germany
3. Department of Urology, Klinikum Lueneburg, Lueneburg, Germany
4. Urology Unit, Ospedale Santa Maria alla Gruccia, Montevarchi, Italy
5. Department of Urology, Zeisigwald Clinics Bethanien, Chemnitz, Germany
6. Department of Urology, Diakonissen Hospital Dessau, Dessau, Germany
7. Istituto Clinico Humanitas IRCCS, Clinical and Research Hospital, Rozzano, Italy