[1] John Radcliffe Hosp, Dept Histopathol, Oxford OX3 9DU, England
[2] Robert Bosch Krankenhaus, Dept Internal Med 1, Innere Med Abt 1, Schwerpunkte Gastroenterol Hepatol & Endokrinol, D-70341 Stuttgart, Germany
[3] Univ Hosp KULeuven, Dept Pathol, Louvain, Belgium
[4] Univ Basel Hosp, Dept Gastroenterol, CH-4031 Basel, Switzerland
[5] Kaunas Univ Med Hosp, Dept Gastroenterol, Kaunas, Lithuania
[6] Vilnius Univ Hosp, Gastroenterol Clin, Vilnius, Lithuania
[7] Univ Brescia, Spedali Civili Brescia, UO Chirurg Gen 1, Cattedra Chirurg Gen, Brescia, Italy
[8] St Marks Hosp, Harrow, Middx, England
[9] Med Univ Vienna, Dept Internal Med 4, Div Gastroenterol & Hepatol, Vienna, Austria
[10] Univ Innsbruck Hosp, Dept Med, A-6020 Innsbruck, Austria
[11] Univ Hosp Schleswig Holstein UKSH, Dept Gen Internal Med, Kiel, Germany
[12] Univ Regensburg, Dept Internal Med 1, D-8400 Regensburg, Germany
[13] Univ Klin Innere Med 4, Gastroenterol & Hepatol Abt, Vienna, Austria