[1] Univ Toronto, Mt Sinai Hosp, IBD Ctr, Dept Med, Toronto, ON M5G 1X5, Canada
[2] Univ Edinburgh, Western Gen Hosp, Dept Gastroenterol, Edinburgh, Midlothian, Scotland
[3] Univ Oxford, Radcliffe Infirm, Gibson Labs, Gastroenterol Unit, Oxford OX2 6HE, England
[4] Univ Manitoba, Dept Med, Gastroenterol Sect, IBD Clin & Res Ctr, Winnipeg, MB, Canada
[5] Johns Hopkins Univ, Sch Med, Dept Med, Harvey M & Lyn P Meyerhoff Inflammatory Bowel Dis, Baltimore, MD 21205 USA
[6] Johns Hopkins Bloomberg Sch Publ Hlth, Dept Epidemiol, Baltimore, MD USA
[7] Univ Roma La Sapienza, Dept Clin Sci, Rome, Italy
[8] CH&U Lille, Hop Huriez, Dept Hepatogastroenterol & Registre EPIMAD, Lille, France
[9] Med Univ Vienna, Div Gastroenterol & Hepatol, Vienna, Austria
[10] Univ Hosp, Dept Pathol, Louvain, Belgium
[11] Univ Oxford, Dept Gastroenterol, Oxford, England
[12] Technion Israel Inst Technol, Bruce Rappaport Fac Med, Rambam Med Ctr, Dept Gastroenterol, IL-31096 Haifa, Israel
[13] Mayo Clin, Coll Med, Div Gastroenterol & Hepatol, Rochester, MN USA
[14] Vrije Univ Amsterdam, Med Ctr, Dept Pathol, Amsterdam, Netherlands
[15] Univ Toronto, Mt Sinai Hosp, Dept Pathol, Toronto, ON M5G 1X5, Canada
[16] Mt Sinai Sch Med, New York, NY USA
[17] Univ Kiel, Inst Clin Mol Biol, Kiel, Germany
[18] Univ Calif Los Angeles, Sch Med, Cedars Sinai Div Gastroenterol, Ctr Inflammatory Bowel Dis, Los Angeles, CA USA
[19] Univ Calif Los Angeles, Sch Med, Inst Immunobiol, Los Angeles, CA USA
[20] Univ Hosp Gasthuisberg, Div Gastroenterol, B-3000 Louvain, Belgium
[21] Univ Oxford, John Radcliffe Hosp, Dept Cellular Pathol, Oxford OX3 9DU, England