[1] Indiana Univ Sch Med, Dept Med, Div Gastroenterol & Hepatol, Indianapolis, IN 46202 USA
[2] Geisel Sch Med Dartmouth, Dept Med, Div Gastroenterol, Hanover, NH USA
[3] White River Junct VAMC, Div Gastroenterol, Dept Med, White River Jct, VT USA
[4] Univ Connecticut, Sch Med, Farmington, CT USA
[5] Geisel Sch Med Dartmouth, Hanover, NH USA
[6] Dartmouth Hitchcock Med Ctr, Dept Med, Sect Gastroenterol & Hepatol, Lebanon, NH USA
[7] New Hampshire Colonoscopy Registry, Lebanon, NH USA
[8] Univ Calif San Francisco, Dept Med, Div Gastroenterol, San Francisco, CA USA
[9] Univ Calif San Francisco Hlth Syst, San Francisco, CA USA
[10] Univ Washington, Sch Med, Dept Med, Div Gastroenterol, Seattle, WA USA
[11] VA Puget Sound Hlth Care Syst, Seattle, WA USA
[12] Univ Calif San Francisco, Dept Med, San Francisco, CA USA
[13] San Francisco VA Med Ctr, Div Gastroenterol, San Francisco, CA USA
[14] Stanford Univ, Sch Med, Dept Med, Div Gastroenterol & Hepatol, Stanford, CA USA
[15] Kaiser Permanente Div Res, Pleasonton, CA USA
[16] NYU Grossman Sch Med, Dept Med, Div Gastroenterol, New York Harbor Vet Affairs Hlth Care Syst, New York, NY USA
[17] Cleveland Clin, Digest Dis Inst, Dept Gastroenterol Hepatol & Nutr, Cleveland, OH USA
[18] Mayo Clin Florida, Div Gastroenterol & Hepatol, Jacksonville, FL USA
[19] Mayo Clin Rochester, Div Gastroenterol & Hepatol, Rochester, MN USA
[20] Univ N Carolina, Div Gastroenterol & Hepatol, Chapel Hill, NC USA