[1] St James Univ Hosp, Leeds Gastroenterol Inst, Leeds LS9 7TF, W Yorkshire, England
[2] McMaster Univ, Div Gastroenterol, Farncombe Family Digest Hlth Res Inst, Hamilton, ON, Canada
[3] Dartmouth Hitchcock Med Ctr, Lebanon, NH 03766 USA
[4] Harvard Univ, Beth Israel Deaconess Med Ctr, Sch Med, Boston, MA 02215 USA
[5] Mayo Clin, Rochester, MN USA
[6] Baylor Univ, Med Ctr, Digest Hlth Associates Texas, Dallas, TX USA
[7] Univ So Calif, Keck Sch Med, Div Gastroenterol, Los Angeles, CA 90033 USA
[8] Univ Calif Los Angeles, Sch Med, UCLA VA Ctr Outcomes Res & Educ CORE, Los Angeles, CA USA
[9] Houston Methodist Hosp, Div Gastroenterol & Hepatol, Houston, TX 77030 USA
[10] Weill Cornell Med Coll, Houston, TX USA