[1] Univ Calgary, Calgary, AB, Canada
[2] Cedars Sinai Med Ctr, Los Angeles, CA 90048 USA
[3] Guys & St Thomas Hosp, Ctr Inflammatory Bowel Dis, London SE1 9RT, England
[4] Univ Chicago, Dept Med, Ctr Inflammatory Bowel Dis, 5841 S Maryland Ave, Chicago, IL 60637 USA
[5] Mt Sinai Sch Med, Dr Henry D Janowitz Div Gastroenterol, New York, NY USA
[6] Jefferson Univ, Philadelphia, PA USA
[7] Mayo Clin, Rochester, MN USA
[8] Univ Calif San Francisco, San Francisco, CA 94143 USA
[9] Alfred Hosp, Dept Gastroenterol, Melbourne, Vic, Australia
[10] Univ Pittsburgh, Pittsburgh, PA USA
[11] Univ British Columbia, Vancouver, BC V5Z 1M9, Canada
[12] Harvard Univ, Beth Israel Deaconess Med Ctr, Sch Med, Boston, MA 02215 USA
[13] Dalhousie Univ, Halifax, NS, Canada
[14] Dartmouth Hitchcock Med Ctr, Ctr Inflammatory Bowel Dis, Lebanon, NH 03766 USA