1. From the Departments of Urology and Biostatistics, University of California-Los Angeles School of Medicine and Department of Surgery, Veterans Administration Greater Los Angeles Healthcare System, Los Angeles, Department of Urology, Stanford University School of Medicine, Urology Section, Department of Surgery, Veterans Administration Medical Center San Francisco, San Francisco and Department of Urology, Naval Medical Center, San Diego, California, and Division of Urology, Medical College of Georgia...