[1] Univ Turku, Inst Clin Med, Family Med, Turku 20500, Finland
[2] Univ Turku, Turku Univ Hosp, Turku 20500, Finland
[3] Univ Hosp, Kiinamyllynkatu 4-8, Turku 20521, Finland
[4] Hlth Ctr Pori, Siltapuistokatu 2, Pori 28100, Finland
[5] Univ Helsinki, Dept Gen Practice & Primary Hlth Care, Yliopistonkatu 4, Helsinki 00100, Finland
[6] Univ Helsinki, Helsinki Univ Hosp, Yliopistonkatu 4, Helsinki 00100, Finland
[7] Helsingin Uudenmaan Sairaanhoitopiiri, Helsinki Univ Hosp, Stenbackinkatu 9,PL 100, HUS-00029 Helsinki, Finland
[8] Folkhalsan Res Ctr, Haartmaninkatu 8, Helsinki 00290, Finland
[9] Univ Kuopio, Univ Hosp Kuopio, Unit Primary Hlth Care, Yliopistonranta 1, Kuopio 70210, Finland
[10] Univ Hosp Kuopio, Puijonlaaksontie 2, Kuopio 70210, Finland
[11] Cent Satakunta Hlth Federat Municipal, Koulukatu 2, Harjavalta 29200, Finland