1 School of Medicine, Virginia Commonwealth University, Richmond, VA; Department of Urology, University of California San Francisco, San Francisco, CA.
2 Department of Urology, University of California San Francisco, San Francisco, CA.
3 Department of Surgery, University of California San Francisco, San Francisco, CA.
4 Department of Urology, University of California San Francisco, San Francisco, CA; Department of Biostatistics and Epidemiology, University of California San Francisco, San Francisco, CA. Electronic address: Benjamin.Breyer@ucsf.edu.