[1] Emory Univ, Sch Med, Dept Med, Div Digest Dis, Atlanta, GA 30322 USA
[2] Atlanta VA Med Ctr, Atlanta, GA 30322 USA
[3] Harvard Med Sch, Brigham & Womens Hosp, Div Gastroenterol Hepatol & Endoscopy, Boston, MA 02115 USA
[4] Univ Calif San Diego, Div Gastroenterol, San Diego, CA 92103 USA
[5] Cleveland Clin, Digest Dis & Surg Inst, Cleveland, OH 44106 USA
[6] Houston Methodist Hosp, Dept Internal Med, Div Gastroenterol, Houston, TX 77030 USA
[7] Texas A&M Univ, Houston, TX USA
[8] Univ Colorado Denver, Div Gastroenterol, Aurora, CO USA
[9] Duke Univ, Div Gastroenterol & Hepatol, Durham, NC USA
[10] Boston Univ, Sch Med, Dept Med, Sect Gastroenterol, Boston, MA 02118 USA
[11] Thomas Jefferson Univ Hosp, Div Gastroenterol & Hepatol, Philadelphia, PA 19107 USA
[12] Washington Univ, Sch Med St Louis, John T Milliken Dept Med, Div Gastroenterol, St Louis, MO 63110 USA
[13] Beth Israel Deaconess Med Ctr, Div Gastroenterol, Boston, MA 02215 USA
[14] Harvard Med Sch, Boston, MA 02115 USA
[15] St Louis Univ, Dept Internal Med, Div Gastroenterol & Hepatol, St Louis, MO 63103 USA
[16] Mayo Clin Arizona, Div Gastroenterol, Scottsdale, AZ USA
[17] Univ Arizona, Phoenix VA Hlth Care Syst, Gastroenterol Sect, Phoenix, AZ USA
[18] Univ Toronto, Div Gastroenterol Hepatol & Nutr, Toronto, ON, Canada
[19] Univ Toronto, Hosp Sick Children, Dept Paediat, Res Inst, Toronto, ON, Canada
[20] Univ Toronto, Hosp Sick Children, Dept Paediat, Learning Inst, Toronto, ON, Canada
[21] Univ Toronto, Wilson Ctr, Toronto, ON, Canada
[22] NYU Grossman Sch Med, Div Gastroenterol, Dept Med, New York, NY USA