1. Section of Gastroenterology Veterans Affairs San Diego Healthcare System San Diego California
2. Department of Medicine University of California at San Diego La Jolla California
3. Moores Cancer Center University of California at San Diego La Jolla California
4. Center for Health Research, Kaiser Permanente Portland Oregon
5. University of Texas Southwestern Medical Center, Harold C. Simmons Cancer Center Dallas Texas
6. Department of Clinical Sciences University of Texas Southwestern Medical Center Dallas Texas
7. University of Texas Southwestern Medical Center, Moncrief Cancer Institute Fort Worth Texas
8. Division of General Medicine and Clinical Epidemiology Department of Medicine University of North Carolina School of Medicine Chapel Hill North Carolina
9. Lineberger Cancer Center University of North Carolina School of Medicine Chapel Hill North Carolina
10. Department of Psychology School of Public Health San Diego State University San Diego California
11. Gastroenterology Section Veterans Affairs Puget Sound Health Care System Seattle Washington
12. Department of Medicine University of Washington School of Medicine Seattle Washington
13. Kaiser Permanente Washington Seattle Washington
14. Health Research Institute, Kaiser Permanente Washington Seattle Washington
15. Department of Family Medicine University of Washington School of Medicine Seattle Washington
16. Clinical Research Division Fred Hutchinson Cancer Research Center Seattle Washington
17. Division of Gastroenterology University of Washington School of Medicine Seattle Washington
18. Gastroenterology Department Kaiser Permanente Medical Center Walnut Creek California
19. Division of Research Kaiser Permanente Oakland California
20. Division of Cancer Prevention and Control National Center for Disease Prevention and Health PromotionCenters for Disease Control and Prevention Atlanta Georgia
21. Department of Medicine Veterans Affairs Medical Center White River Junction Vermont
22. Geisel School of Medicine at Dartmouth Hanover New Hampshire
23. Division of Digestive and Liver Diseases University of Texas Southwestern Medical Center Dallas Texas
24. Department of Internal Medicine and LiveStrong Cancer Institutes Dell Medical School University of Texas Austin Austin Texas