1. Department of Urology, The University of Texas Health Science Center at San Antonio, San Antonio, Texas
2. Department of Cellular and Structural Biology, The University of Texas Health Science Center at San Antonio, San Antonio, Texas
3. Department of Pediatrics, The University of Texas Health Science Center at San Antonio, San Antonio, Texas
4. Departments of Pathology and Preventive Medicine and Biometrics, University of Colorado at Denver and Health Sciences Center, Aurora, Colorado