[1] CHU Vaudois, Div Gastroenterol & Hepatol, CH-1011 Lausanne, Switzerland
[2] Univ Bern, Inst Social & Prevent Med, Bern, Switzerland
[3] Viollier AG, Inst Pathol, Basel, Switzerland
[4] Univ Zurich Hosp, Div Gastroenterol & Hepatol, CH-8091 Zurich, Switzerland
[5] Kantonsspital Baden, Div Gastroenterol & Hepatol, Baden, Switzerland
[6] Univ Bern, Inst Pharmacol, Bern, Switzerland
[7] Univ Basel Hosp, Div Gastroenterol & Hepatol, CH-4031 Basel, Switzerland