[1] Univ Lausanne, Ctr Primary Care & Publ Hlth Unisante, Lausanne, Switzerland
[2] Univ Toulouse, Univ Toulouse III Paul Sabatier, CERPOP, Inserm, Toulouse, France
[3] Univ Southern Denmark, Dept Clin Res, Odense, Denmark
[4] Univ Bern, Inst Primary Hlth Care BIHAM, Bern, Switzerland
[5] Univ Zurich, Zurich, Switzerland
[6] Univ Geneva, Geneva Univ Hosp, Geneva, Switzerland
[7] Ctr Primary Care & Publ Hlth Unisante, Dept Ambulatory Care, Rue Bugnon 44, CH-1012 Lausanne, Switzerland