1 Division of Gastroenterology, Department of Medicine, University of Minnesota, Minneapolis, Minnesota.
2 Division of Gastroenterology, Department of Medicine, VA Medical Center, White River Junction, Vermont, Geisel School of Medicine at Dartmouth, Hanover New Hampshire.
3 Department of Gastroenterology and Hepatology, Digestive Disease and Surgical Institute, The Cleveland Clinic, Cleveland, Ohio.
4 Department of Pathology, Pathology and Laboratory Medicine Institute, The Cleveland Clinic, Cleveland, Ohio.
5 Division of Gastroenterology and Hepatology, Oregon Health & Science University, Portland, OR.
6 Division of Gastroenterology, Department of Medicine, Geisel School of Medicine at Dartmouth, Hanover, New Hampshire, USA; Division of Gastroenterology, Department of Medicine, White River Junction VAMC, White River Junction, Vermont, USA; Division of Gastroenterology, Department of Medicine, University of Connecticut School of Medicine, Farmington Connecticut, USA.
7 Gastroenterology Section, Hospital and Specialty Medicine, VA Puget Sound Health Care System, Seattle, Washington, USA; Division of Gastroenterology, Department of Medicine, University of Washington School of Medicine, Seattle, Washington, USA.
8 Division of Gastroenterology, Department of Medicine, Veterans Affairs San Diego Healthcare System, San Diego, California, USA; Moores Cancer Center and Department of Family Medicine and Public Health, University of California San Diego, La Jolla, California, USA; Division of Gastroenterology, Department of Internal Medicine, University of California San Diego, La Jolla, California, USA.
9 Division of Gastroenterolgy/Hepatology, Department of Medicine, Indiana University School of Medicine, Indianapolis, Indiana.