Centers of Excellence Gastroenterology   Centers of Excellence Cleveland Clinic, The Columbia University Gastroenterology Web Free University of Brussels, The Jefferson Digestive Disease Institute Johns Hopkins University, Gastroenterology and Hepatology Resource Center Loyola University Health System, Division of Gastroenterology McMaster University, Intestinal Disease Research Programme Medical University of South Carolina, Digestive Disease Center Queen's University, UK, Gastrointestinal Disease Research State University of New York, Stonybrook, Division of Gastroenterology-Hepatology Temple University, Gastroenterology Section  University of California Los Angeles, Division of Digestive Diseases University of Florida Gainesville, Gastroenterology, Hepatology and Nutrition University of North Carolina, Division of Digestive Diseases and Nutrition University of Pennsylvania, Gastroenterology Division University of RostockGremany,  Gastroenterology Division University of Vienna, Austria, Department of Gastroenterology and Hepatology University of Virginia, Division of Gastroenterology and Hepatology  University of Virginia, Center For Study of Diseases Due To H.pylori Vanderbilt University, Division of Gastroenterology, Hepatology and Nutrition Updated 05/19/03