[1] Univ Toronto, Mt Sinai Hosp, Ctr Inflammatory Bowel Dis, Dept Med, Toronto, ON M5G 1X5, Canada
[2] Univ Toronto, Dept Obstet & Gynecol, Toronto, ON, Canada
[3] Univ Calgary, Dept Med, Calgary, AB, Canada
[4] Univ Calgary, Dept Community Hlth Sci, Calgary, AB, Canada
[5] Univ Calgary, Div Gastroenterol, Calgary, AB, Canada
[6] Univ Alberta, Dept Med, Div Gastroenterol, Edmonton, AB, Canada
[7] Dalhousie Univ, Dept Med, Halifax, NS, Canada
[8] McMaster Univ, Dept Med, Hamilton, ON, Canada
[9] Univ Calif San Francisco, Dept Med, San Francisco, CA USA
[10] Erasmus Univ, Med Ctr, Dept Gastroenterol & Hepatol, Rotterdam, Netherlands