1. Physiology/Ergonomics, Institute of Biomedicine, University of Eastern Finland, Kuopio, Finland
2. Population Research Unit, Department of Sociology, University of Helsinki, Helsinki, Finland
3. Department of Public Health, University of Helsinki, Helsinki, Finland
4. Division of Insurance Medicine, Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden
5. Research Department, The Social Insurance Institution of Finland, Helsinki, Finland
6. Department of General Practice, University of Tampere, Tampere, Finland
7. Department of Mental Health and Substance Abuse Services, National Institute for Health and Welfare, Finland
8. Institute for Molecular Medicine, University of Helsinki, Helsinki, Finland