1. Department of Radiology, Memorial Sloan Kettering Cancer Center, New York, NY.
2. Present address: Department of Radiology, The Christie NHS Foundation, 550 Wilmslow Rd, Manchester M20 4BX, UK.
3. Present address: Dr. Jones & Partners Medical Imaging, Eastwood, Australia.
4. Department of Surgery, Urology Service, Memorial Sloan Kettering Cancer Center, New York, NY.