[1] Gastroenterol & Hepatol Ctr, Zurich, Switzerland
[2] Univ Hosp Zurich, Dept Gastroenterol & Hepatol, Zurich, Switzerland
[3] GZO Zurich Reg Hlth Ctr, Dept Internal Med, Wetzikon, Switzerland
[4] Cleveland Clin, Digest Dis & Surg Inst, Div Gastroenterol Hepatol & Nutr, Cleveland, OH 44106 USA
[5] Klinikum Lueneburg, Div Gastroenterol & Hepatol, Luneburg, Germany
[6] Univ Henri Poincare 1, Univ Hosp Nancy, Dept Hepatogastroenterol, Inserm U954, Vandoeuvre Les Nancy, France
[7] Univ Hosp Lausanne CHUV, Div Gastroenterol & Hepatol, Lausanne, Switzerland
[8] Univ Lausanne, Lausanne, Switzerland
[9] Univ Chicago, Ctr Inflammatory Bowel Dis, Chicago, IL 60637 USA