[1] Vet Affairs San Diego Healthcare Syst, San Diego, CA USA
[2] Univ Calif San Diego, Div Gastroenterol, La Jolla, CA 92093 USA
[3] Moores Canc Ctr, La Jolla, CA USA
[4] Oregon Hlth & Sci Univ, Dept Med, Div Gastroenterol, Portland, OR 97201 USA
[5] Vet Affairs Med Ctr, White River Jct, VT USA
[6] Geisel Sch Med Dartmouth, Hanover, NH USA
[7] Univ Connecticut, Hlth Ctr, Farmington, CT USA
[8] Cleveland Clin, Dept Gastroenterol & Hepatol, Cleveland, OH 44106 USA
[9] Vet Affairs Puget Sound Hlth Care Syst, Seattle, WA USA
[10] Univ Washington, Sch Med, Seattle, WA USA
[11] San Francisco VA Med Ctr, San Francisco, CA USA
[12] Univ Calif San Francisco, San Francisco, CA 94143 USA
[13] Minneapolis Vet Affairs Med Ctr, Minneapolis, MN USA
[14] Univ Minnesota, Minneapolis, MN USA
[15] Harvard Med Sch, Brigham & Womens Hosp, Dept Med, Div Gastroenterol, Boston, MA 02115 USA
[16] Dana Farber Canc Inst, Div Canc Genet & Prevent, Boston, MA 02115 USA
[17] Indiana Univ Sch Med, Dept Med, Div Gastroenterol & Hepatol, Indianapolis, IN 46202 USA