[1] Univ Western Ontario, Robarts Res Inst, London, ON N6A 5K8, Canada
[2] Hop St Louis, GI Unit, Paris, France
[3] Karolinska Hosp, Dept Gastroenterol & Hepatol, S-10401 Stockholm, Sweden
[4] St Vincents Hlth, Melbourne, Vic, Australia
[5] Univ Amsterdam, Acad Med Ctr, Dept Gastroenterol, NL-1105 AZ Amsterdam, Netherlands
[6] Univ Calgary, Inflammatory Bowel Dis Clin, Calgary, AB, Canada
[7] CHU Vaudois, Div Gastroenterol & Hepatol, Lausanne, Switzerland
[8] Univ Munich, Klinikum Grosshadern, D-8000 Munich, Germany
[9] Univ Kiel, Kiel, Germany
[10] Mt Sinai Hosp, IBD Ctr, Toronto, ON M5G 1X5, Canada
[11] Univ Queensland, Nambour, Australia
[12] Univ Udine, Dept Expt & Clin Med, I-33100 Udine, Italy
[13] Erasmus MC, Rotterdam, Netherlands
[14] Univ Hosp Gasthuisberg, Dept Gastroenterol, B-3000 Louvain, Belgium
[15] Univ Louvain, Louvain, Belgium