Andrea Minervini1, Andrea Mari2, Riccardo Campi3, Marco Carini2. 1. Department of Urology, University of Florence, Careggi Hospital, Florence, Italy. Electronic address: andreamine@libero.it. 2. Department of Urology, University of Florence, Careggi Hospital, Florence, Italy. 3. Department of Urology, University of Florence, Careggi Hospital, Florence, Italy; Department of Experimental and Clinical Medicine, University of Florence, Florence, Italy.