1. Department of Urology, Stanford University School of Medicine, Stanford, California, USA.
2. Veterans Affairs Palo Alto Health Care System, Palo Alto, California, USA.
3. Department of Medicine (Nephrology), Stanford University School of Medicine, Stanford, California, USA.
4. Department of Surgery, Western University, London, Canada.
5. Division of Urology, Santa Clara Valley Medical Center, San Jose, California, USA.