1. Department of Urology, Loma Linda University, Loma Linda, CA 92354, USA
2. Department of Urology, University of Texas Health Science Center San Antonio, San Antonio, TX 78229, USA
3. Department of Epidemiology & Biostatistics, University of Texas Health Science Center San Antonio, San Antonio, TX 78229, USA
4. Division of Epidemiology, Department of Medicine, University of Utah Health Science Center, Salt Lake City, UT 84132, USA
5. Department of Surgery, South Texas Veterans Healthcare System, San Antonio, TX 78229, USA