1. Department of Urology, David Geffen School of Medicine, University of California-Los Angeles, Los Angeles, California
2. Department of Urology, Sharp Rees-Stealy Medical Group, San Diego, California
3. Department of Biostatistics, David Geffen School of Medicine, University of California-Los Angeles, Los Angeles, California
4. Department of Surgery, City of Hope National Medical Center, Duarte, California