作者单位:Digestive Disease Institute, Virginia Mason Medical Center, 1100 Ninth Ave, Seattle, WA 98101[1]Division of Gastroenterology and Hepatology, University Hospital, Indiana University, 550[2]Department of Internal Medicine, University of Tennessee College of Medicine, Chattanooga, 979 East[3]Division of Gastroenterology and Hepatology, Regenstrief Health Center, Indiana University, 1050[4]