1. Division of Gastroenterology and Hepatology; University of Colorado Anschutz Medical Center; Aurora Colorado
2. Division of Gastroenterology and Hepatology; Veterans Affairs Medical Center; Denver Colorado
3. Arizona Center for Digestive Health; Gilbert Arizona
4. University of Kansas School of Medicine; Kansas City Missouri
5. Veterans Affairs Medical Center; Kansas City Missouri
6. Division of Cancer Epidemiology and Genetics; National Cancer Institute; Rockville Maryland
7. Information Management Services Inc; Rockville Maryland