[1] Univ Hosp Leuven, Div Gastroenterol, Louvain, Belgium
[2] Pk Klin Weissensee, Dept Internal Med, Berlin, Germany
[3] Univ Bologna, Dept Clin Med, Bologna, Italy
[4] Univ London Imperial Coll Sci Technol & Med, London, England
[5] St Vincents Hosp, Dept Med, Melbourne, Vic, Australia
[6] St Vincents Hosp, Dept Gastroenterol, Melbourne, Vic, Australia
[7] Sahlgrens Univ Hosp, Dept Internal Med, Gothenburg, Sweden
[8] CHU Nantes, Dept Liver & Gastroenterol, Inst Dis Digest Syst Nantes, Nantes, France
[9] Univ Zurich Hosp, Div Gastroenterol & Hepatol, CH-8091 Zurich, Switzerland