1. Division of Gastroenterology and Hepatology, University of Michigan, Ann Arbor
2. Department of Biostatistics, Dana Farber Cancer Center, Boston, Massachusetts
3. Center for Innovations in Quality, Effectiveness and Safety, Michael E. DeBakey Veterans Affairs Medical Center, Houston, Texas
4. Department of Medicine, Michael E. DeBakey Veterans Affairs Medical Center and Baylor College of Medicine, Houston, Texas
5. Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas
6. Fred Hutchinson Cancer Research Center, Seattle, Washington
7. Division of Gastroenterology and Hepatology, Department of Medicine, Baylor College of Medicine, Houston, Texas
8. Harold C. Simmons Cancer Center, University of Texas Southwestern Medical Center, Dallas