1. Department of Internal Medicine, New York Presbyterian–Columbia University Medical Center, New York, NY.
2. Present address: Department of Gastroenterology, Mount Sinai Hospital, New York, NY.
3. Department of Radiology, New York Presbyterian–Columbia University Medical Center, 622 W 168th St, PB-1-301, New York, NY 10032.
4. Herbert Irving Cancer Center, New York Presbyterian–Columbia University Medical Center, New York, NY.
5. Department of Surgery, New York Presbyterian–Columbia University Medical Center, New York, NY.