[1] Univ Oulu, Fac Med, Res Unit Hlth Sci & Technol, Oulu, Finland
[2] Tampere Univ, Fac Social Sci Hlth Sci, Nursing Sci, Tampere, Finland
[3] Univ Oulu, Fac Med, Arctic Biobank, Northern Finland Birth Cohorts,Infrastruct Populat, Oulu, Finland
[4] Univ Oulu, Fac Med, Res Unit Hlth Sci & Technol, Aapistie 5, POB 5000, FIN-90230 Oulu, Finland