[1] Univ Lausanne, Inst Social & Prevent Med, Healthcare Evaluat Unit, Lausanne, Switzerland
[2] Hop Neuchatelois, Serv Gastroenterol, Neuchatel, Switzerland
[3] Univ Lausanne Hosp, Dept Gastroenterol & Hepatol, Lausanne, Switzerland
[4] Clin La Source Beaulieu, Crohn & Colitis Ctr, Lausanne, Switzerland