1. Division of Gastroenterology and Hepatology; University of Missouri School of Medicine; One Hospital Drive, CE 405 Columbia Missouri 65212
2. Department of Health Management and Informatics; University of Missouri School of Medicine; One Hospital Drive CE707 CS&E Bldg Columbia Missouri 65212
3. Missouri Cancer Registry and Research Center; University of Missouri at Columbia; 401 Clark Hall Columbia Missouri 65211
4. Section of Gastroenterology; Loma Linda VA Medical Center; Loma Linda California