[1] Oulu Univ Hosp, Med Res Ctr Oulu, Oulu, Finland
[2] Univ Oulu, Oulu, Finland
[3] Univ Oulu, Fac Med, Ctr Life Course Hlth Res, Oulu, Finland
[4] Mikkeli Cent Hosp Essote, Dept Gen Med, Mikkeli, Finland
[5] Univ Jyvaskyla, Dept Hlth Sci, Jyvaskyla, Finland
[6] Occupat Hlth Care Ctr Pihlajalinna, Tampere, Finland
[7] Oulunkaari Hlth Ctr, Li, Finland
[8] Orebro Univ, Ctr Hlth & Med Psychol, Dept Law Psychol & Social Work, Orebro, Sweden
[9] Keele Univ, Inst Primary Care & Hlth Sci, Keele ST5 5BG, Staffs, England
[10] Finnish Inst Occupat Hlth, Oulu, Finland