[1] Univ Bologna, Dept Urol, Bologna, Italy
[2] Univ Bologna, Cardionephrothorac Sci Doctorate, Dept Expt Diagnost & Specialty Med DIMES, Bologna, Italy
[3] UCL, Div Surg & Intervent Sci, London, England
[4] Univ Toronto, Sunnybrook Res Inst, Div Urol, Toronto, ON, Canada
[5] Johns Hopkins Med Inst, James Buchanan Brady Urol Inst, Baltimore, MD 21205 USA
[6] New York Univ, Langone Med Ctr, Dept Urol, Div Urol Oncol, New York, NY USA
[7] Univ Clin Giessen, Dept Urol Pediat Urol & Androl, Giessen, Germany
[8] NYU, Dept Urol, New York, NY USA