[1] Univ Turku, Dept Publ Hlth, FI-20014 Turku, Finland
[2] Finnish Inst Occupat Hlth, Helsinki, Finland
[3] Harvard TH Chan Sch Publ Hlth, Dept Social & Behav Sci, Boston, MA USA
[4] Univ Helsinki, Fac Med, Clinicum, Helsinki, Finland
[5] UCL, Dept Epidemiol & Publ Hlth, London, England
[6] Univ Skovde, Sch Hlth & Educ, Skovde, Sweden
[7] Turku Univ Hosp, Turku, Finland