[1] Imperial Coll London, London, England
[2] Chelsea & Westminster Hosp, London, England
[3] Chaim Sheba Med Ctr, Dept Gastroenterol & Hepatol, Tel Hashomer, Israel
[4] Univ Hosp Munster, Dept Med B, Munster, Germany
[5] Venizeleio Gen Hosp, Dept Gastroenterol, Iraklion, Crete, Greece
[6] Univ & Med Sch Ioannina, Dept Gastroenterol & Hepatol, Ioannina, Greece
[7] Tel Hashomer Sheba Med Ctr, Dept Gastroenterol, Ramat Gan, Israel
[8] Tel Aviv Univ, Sackler Sch Med, Tel Aviv, Israel
[9] Hosp Luneburg, Dept Internal Med & Gastroenterol, Luneburg, Germany
[10] Univ Szeged, Dept Med 1, Szeged, Hungary
[11] Univ Cambridge, Dept Med, Cambridge, England
[12] Hull & East Yorkshire NHS Trust, IBD Unit, Kingston Upon Hull, N Humberside, England
[13] Univ Algarve, Biomed Sci & Med Dept, Algarve Hosp Ctr, Gastroenterol Dept, Faro, Portugal
[14] Agaples Markus Hosp, Dept Med 1, Frankfurt, Germany
[15] Univ Paris Sud, CHU Bicetre, Dept Gastroenterol, Paris, France