1. Department of Radiology, Memorial Sloan-Kettering Cancer Center, 1275 York Ave, New York, NY 10065.
2. Department of Diagnostic and Interventional Radiology, Universitätsmedizin Mainz, Mainz, Germany.
3. Department of Medical Physics, Memorial Sloan-Kettering Cancer Center, New York, NY.
4. Department of Epidemiology and Biostatistics, Memorial Sloan-Kettering Cancer Center, New York, NY.
5. Department of Pathology, Memorial Sloan-Kettering Cancer Center, New York, NY.
6. Department of Surgery, Urology Service, Memorial Sloan-Kettering Cancer Center, New York, NY.