1 Division of Gastroenterology/Hepatology, Indiana University School of Medicine, Indianapolis, Indiana. Electronic address: drex@iupui.edu.
2 Division of Gastroenterology and Hepatology, Stanford University School of Medicine, Stanford, California.
3 Department of Veterans Affairs Medical Center, White River Junction, Vermont; Division of Gastroenterology and Hepatology, Geisel School of Medicine at Dartmouth, Hanover, New Hampshire; Division of Gastroenterology and Hepatology, University of Connecticut School of Medicine, Farmington, Connecticut.
4 New York University Grossman School of Medicine, New York Harbor Veterans Affairs Medical Center, New York, New York.
5 Division of Gastroenterology and Hepatology, Dartmouth-Hitchcock Medical Center, Geisel School of Medicine at Dartmouth, Hanover, New Hampshire.
6 National Gastroenterology and Hepatology Program, Veterans Health Administration, Washington, District of Columbia; Division of Gastroenterology, Department of Medicine, University of Washington School of Medicine, Seattle, Washington.
7 Veterans Affairs San Francisco Healthcare System, San Francisco, California; Division of Gastroenterology, Department of Medicine, University of California San Francisco, San Francisco, California.
8 The Kaiser Permanente Division of Research, Oakland, California.
9 Department of Biomedical Sciences, Humanitas University, Pieve Emanuele, Italy; Endoscopy Unit, Humanitas Clinical and Research Center Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS), Rozzano, Milan, Italy.