1. Division of Gastroenterology, Department of Internal Medicine; University of Utah; Salt Lake City Utah
2. Huntsman Cancer Institute; Salt Lake City Utah
3. Division of Epidemiology, Department of Internal Medicine; University of Utah; Salt Lake City Utah
4. Department of Physiology and Neurobiology; University of Connecticut; Storrs Connecticut
5. Veterans Affairs Connecticut Healthcare System; West Haven Connecticut
6. Department of Internal Medicine, Section of Digestive Diseases; Yale University; New Haven Connecticut
7. Department of Pathology; University of Utah; Salt Lake City Utah