1. Department of Surgery; Obafemi Awolowo University; Ile-Ife Nigeria
2. Department of Radiology; Memorial Sloan-Kettering Cancer center; New York New York
3. AIDS Prevention Initiative in Nigeria; Ibadan Nigeria
4. Department of Radiology; Obafemi Awolowo University; Ile-Ife Nigeria
5. Downstate Medical Center; State University of New York; New York New York
6. Department of Surgery; Memorial Sloan-Kettering Cancer Center; New York New York