[1] Mt Sinai Hosp, IBD Ctr, Toronto, ON M5G 1X5, Canada
[2] Johns Hopkins Univ, Meyerhoff Inflammatory Bowel Dis Ctr, Baltimore, MD USA
[3] Johns Hopkins Sch Med, Div Gastroenterol, Baltimore, MD USA
[4] McGill Univ, Ctr Hlth, Royal Victoria Hosp Site, Montreal, PQ, Canada
[5] Univ Chicago, Dept Hlth Studies, Chicago, IL 60637 USA
[6] Univ Pittsburgh, Med Ctr, Div Gastroenterol, Pittsburgh, PA USA
[7] Univ Puerto Rico, Sch Med, Dept Med, San Juan, PR 00936 USA
[8] Univ Chicago, Dept Med, Chicago, IL 60637 USA
[9] McGill Univ, Ctr Hlth, Montreal Gen Hosp, Montreal, PQ, Canada
[10] Cleveland Clin Fdn, Cleveland, OH 44195 USA
[11] Univ Toronto, Hosp Sick Children, Toronto, ON M5G 1X8, Canada
[12] Univ Montreal, Montreal Heart Inst, Montreal, PQ, Canada
[13] David Geffen UCLA Sch Med, Cedars Sinai Med Ctr, Inst Med Genet, Los Angeles, CA 90048 USA
[14] Univ Toronto, Dept Med, Toronto, ON, Canada
[15] Yale Univ, IBD Ctr, Sect Digest Dis, New Haven, CT USA
[16] Yale Univ, Dept Genet, New Haven, CT USA