1. Department of Urology, Helen Diller Comprehensive Cancer Center, University of California, San Francisco, San Francisco, California
2. Department of Urology, Humanitas Clinical and Research Center (IRCCS), Rozzano, Italy
3. Department of Urology, Sapienza Rome University, Policlinico Umberto I, Rome, Italy
4. Department of Epidemiology & Biostatistics, University of California, San Francisco, San Francisco, California