1. Division of Nephrology, Department of Medicine, Stanford University School of Medicine, Palo Alto, California
2. Division of Nephrology, Department of Urology, Veterans Affairs Palo Alto Health Care System, Palo Alto, California
3. Department of Urology, Stanford University School of Medicine, Palo Alto, California
4. Department of Surgery, Stanford University School of Medicine, Palo Alto, California
5. Department of Urology, Santa Clara Valley Medical Center, San Jose, California
6. Department of Epidemiology and Population Health, Stanford University School of Medicine, Palo Alto, California