1. Departments of Radiation Oncology and Urology, Memorial Sloan Kettering Cancer Center, New York, New York
2. Department of Radiation Oncology, Continuum Cancer Center of New York, New York, New York
3. Department of Epidemiology and Biostatistics, Memorial Sloan Kettering Cancer Center, New York, New York
4. Departments of Radiation Oncology and Urology, Mt. Sinai Medical Center, New York, New York