1. From the Department of Urology, University of Texas Southwestern Medical Center at Dallas (AG, CGR) and Department of Epidemiology and Biostatistics, University of Texas School of Public Health, Dallas Regional Campus at University of Texas Southwestern Medical Center (AG, CA), Dallas, Texas, and Departments of Urology, Nagoya University School of Medicine (MG, SO), Nagoya-shi and Sapporo Medical University School of Medicine (NM, TT), Sapporo, Japan