1. Department of Urology, Ospedale Policlinico San Martino, Istituto di Ricerca e Cura a Carattere Scientifico per l’oncologia, University of Genova, Genoa, Italy;
2. Department of Urology, Stellenbosch University and Tygerberg Hospital, Cape Town, South Africa;
3. Division of Urology, AOU Maggiore della Carità, University of Easter Piedmont, Novara, Italy;
4. U.O. Biostatistics, Department of Health Sciences, University of Genoa, Genoa, Italy;
5. Division of Urology, Degli Infermi Hospital, Biella, Italy