[1] Cambridge Univ Hosp NHS Fdn Tru, Dept Gastroenterol, Addenbrookes Hosp, Cambridge, England
[2] Viseu Unit Tondela Viseu Hosp Ctr, Dept Gastroenterol, Viseu, Portugal
[3] Univ Munster, Med Fac, Munster, Germany
[4] Hosp Clin Univ Lozano Blesa, Dept Gastroenterol, Zaragoza, Spain
[5] Univ Hosp Ghent, Dept Gastroenterol, Ghent, Belgium
[6] Univ Ghent, Dept Internal Med & Pediat, Ghent, Belgium
[7] Imelda GI Clin Res Ctr, Dept Gastroenterol, Bonheiden, Belgium
[8] Univ Autonoma Madrid UAM, Inst Investigac Sanitaria Princesa IISPrincesa, Gastroenterol Unit, Hosp Univ La Princesa, Madrid, Spain
[9] Univ Melbourne, Dept Gastroenterol, St Vincents Hosp, Melbourne, Australia
[10] Univ Florence, Dept Expt & Clin Biomed Sci Mario Serio, Gastroenterol Res Unit, Florence, Italy
[11] Careggi Univ Hosp, IBD Referral Ctr, Gastroenterol Dept, Florence, Italy
[12] IRCCS San Raffaele Hosp, Dept Gastroenterol & Endoscopy, Milan, Italy
[13] Univ Med Ctr Groningen, Dept Paediat Gastroenterol, Groningen, Netherlands
[14] Liege Univ Hosp CHU Liege, Dept Hepato Gastroenterol & Digest Oncol, Liege, Belgium
[15] Harvard Med Sch, Beth Israel Deaconess Med Center, Ctr Inflammatory Bowel Dis, Div Gastroenterol, Boston, MA USA