1. Department of Medicine, Division of Gastroenterology, Hepatology and Nutrition
2. Division of Gastroenterology and Hepatology, Mayo Clinic, Rochester, MN
3. Department of Medicine, Division of Gastroenterology & Hepatology, University of Pennsylvania, Philadelphia, PA
4. Division of Gastroenterology and Hepatology, Johns Hopkins University School of Medicine, Baltimore, MD
5. Department of Pathology, University of Minnesota, Minneapolis
6. Division of Digestive Disease and Nutrition, University of Oklahoma, Oklahoma City, OK
7. Department of Medicine, Division of Gastroenterology, Stanford University, Stanford, CA
8. Division of Gastroenterology, Washington University School of Medicine, St. Louis, MO