1 Division of Gastroenterology and Hepatology, Department of Medicine, Indiana University School of Medicine, Indianapolis, Indiana, USA.
2 Division of Gastroenterology, Department of Medicine, Geisel School of Medicine at Dartmouth, Hanover, New Hampshire, USA.
3 Division of Gastroenterology, Department of Medicine, White River Junction VAMC, White River Junction, Vermont, USA.
4 University of Connecticut School of Medicine, Farmington, Connecticut, USA.
5 Geisel School of Medicine at Dartmouth, Hanover, New Hampshire, USA.
6 Department of Medicine, Section of Gastroenterology and Hepatology, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire, USA.
7 New Hampshire Colonoscopy Registry, Lebanon, New Hampshire, USA.
8 Division of Gastroenterology, Department of Medicine, University of California San Francisco, San Francisco, California, USA.
9 Chief Medical Officer, University of California San Francisco Health System, San Francisco, California, USA.
10 Division of Gastroenterology, Department of Medicine, University of Washington School of Medicine, Seattle, Washington, USA.
11 VA Puget Sound Health Care System, Seattle, Washington, USA.
12 Department of Medicine, University of California, San Francisco, California, USA.
13 Division of Gastroenterology, San Francisco Veterans Affairs Medical Center, San Francisco, California, USA.
14 Division of Gastroenterology and Hepatology, Department of Medicine, Stanford University School of Medicine, Stanford, California, USA.
15 Kaiser Permanente Division of Research, Pleasonton, California, USA.
16 Division of Gastroenterology, Department of Medicine, NYU Grossman School of Medicine, New York Harbor Veterans Affairs Health Care System, New York, New York, USA.
17 Department of Gastroenterology, Hepatology and Nutrition, Digestive Diseases Institute, Cleveland Clinic, Cleveland, Ohio, USA.
18 Division of Gastroenterology and Hepatology, Mayo Clinic Florida, Jacksonville, Florida, USA.
19 Division of Gastroenterology and Hepatology, Mayo Clinic Rochester, Rochester, Minnesota, USA.
20 Division of Gastroenterology and Hepatology, University of North Carolina, Chapel Hill, North Carolina, USA.