[1] CHU Vaudois, Dept Gastroenterol & Hepatol, CH-1011 Lausanne, Switzerland
[2] Univ Lausanne, Lausanne, Switzerland
[3] CHU Vaudois, Inst Social & Prevent Med IUMSP, Healthcare Evaluat Unit, CH-1011 Lausanne, Switzerland
[4] Univ Basel, Dept Gastroenterol, Basel, Switzerland
[5] Univ Hosp Maastricht, Dept Internal Med & Gastroenterol, Maastricht, Netherlands
[6] Univ Roma La Sapienza, Dipartimento Sci Clin, Rome, Italy
[7] Univ Bern, Inselspital, Dept Gastroenterol, CH-3010 Bern, Switzerland