[1] Univ Hosp Careggi, Dept Gastroenterol, I-500139 Florence, Italy
[2] Hop St Antoine, AP HP, Dept Gastroenterol, F-75571 Paris, France
[3] Univ Paris 06, Paris, France
[4] Natl Univ Ireland, Sch Med, Pharmacol & Therapeut, Galway, Ireland
[5] Univ Roma Tor Vergata, GI Unit, Dept Syst Med, Rome, Italy
[6] Agaples Markus Krankenhaus, Med Klin 1, Frankfurt, Germany
[7] Goethe Univ Frankfurt, Dept Med, Hematol Oncol, D-60054 Frankfurt, Germany
[8] Univ Hosp Leuven, Dept Haematol, Leuven, Belgium
[9] Univ Zurich, Dept Dermatol, Zurich, Switzerland
[10] Humanitas Res Hosp, Dept Gastroenterol, Rozzano, Italy
[11] Hop St Louis, Serv Hepatogastroenterol, Paris, France
[12] Univ Michigan, Dept Internal Med, Ann Arbor, MI 48109 USA
[13] Univ Ioannina, Sch Med, Dept Gastroenterol, GR-45110 Ioannina, Greece
[14] Radboud Univ Nijmegen, Dept Gastroenterol & Hepatol, NL-6525 ED Nijmegen, Netherlands
[15] Univ Naples 2, Unit Colorectal Surg, Dept Med Surg Neurol Metab & Ageing Sci, Naples, Italy
[16] Univ Spital Zurich, Klin Gastroenterol & Hepatol, Zurich, Switzerland
[17] Univ Cattolica Sacro Cuore, Dept Internal Med, Div Gastroenterol, Rome, Italy
[18] Childrens Mem Hlth Inst, Dept Pediat Nutr & Metab Disorders, Warsaw, Poland