[1] Univ Amsterdam, Acad Med Ctr, Dept Social Med, NL-1105 AZ Amsterdam, Netherlands
[2] Netherlands Inst Hlth Serv Res, NIVEL, Utrecht, Netherlands
[3] Inst Res & Informat Hlth Econ IRDES, Paris, France
[4] Jordi Gol Fdn, IDIAP, Catalonia, Spain
[5] Univ Tromso, Dept Community Med ISM, Fac Hlth Sci, N-9001 Tromso, Norway
[6] Univ Sheffield, Sch Hlth & Related Res ScHARR, Sheffield, S Yorkshire, England
[7] Tartu Univ Hosp, Dept Internal Med, Tartu, Estonia
[8] Jagiellonian Univ, Coll Med, Dept Family Med, PL-31007 Krakow, Poland
[9] Univ Ljubljana, Dept Family Med, Ljubljana 61000, Slovenia
[10] Reg Toscana, Florence, Italy
[11] Univ Hosp, Inst Gen Practice, Dusseldorf, Germany
[12] Univ Leicester, Dept Hlth Sci, Leicester, Leics, England
[13] Univ Maastricht, Fac Hlth Sci, Dept Int Publ Hlth, Maastricht, Netherlands