1. Department of Urology, University of Texas MD Anderson Cancer Center, Houston, Texas
2. Department of Urology, Centre Hospitalier de l'Universite de Montreal, Montreal, Quebec, Canada
3. Department of Urology, Louisiana State University Health Science Center-New Orleans, New Orleans, Louisiana
4. Department of Urology, University of Kentucky, Lexington, Kentucky
5. Department of Urology, University of Pittsburgh Medical Center Central Pennsylvania, Harrisburg, Pennsylvania
6. Department of Biostatistics, University of Texas MD Anderson Cancer Center, Houston, Texas