[1] Univ Lausanne Hosp, Inst Social & Prevent Med IUMSP, Healthcare Evaluat Unit, Lausanne, Switzerland
[2] Univ Lausanne Hosp, Div Gastroenterol & Hepatol, Lausanne, Switzerland
[3] Clin Source Beaulieu, Crohn & Colitis Ctr, Lausanne, Switzerland
[4] Univ Basel Hosp, Div Gastroenterol & Hepatol, CH-4031 Basel, Switzerland
[5] Hop Neuchatelois, Div Gastroenterol, Neuchatel, Switzerland