1. Department of Urologic Oncology, The University of Texas M. D. Anderson Cancer Center, Houston, Texas
2. Department of Biostatistics and Applied Mathematics, The University of Texas M. D. Anderson Cancer Center, Houston, Texas
3. Department of Pathology, The University of Texas M. D. Anderson Cancer Center, Houston, Texas
4. Department of Genitourinary Medical Oncology, The University of Texas M. D. Anderson Cancer Center, Houston, Texas