1. Department of Psychology and Logopedics, Medicum, University of Helsinki, Helsinki, Finland
2. Department of Occupational Health, Finnish Institute of Occupational Health, Helsinki, Finland
3. Clinicum, University of Helsinki, Helsinki, Finland
4. Department of Public Health, University of Turku and Turku University Hospital, Turku, Finland
5. Institute of Public Health and Caring Sciences, University of Uppsala, Uppsala, Sweden
6. Department of Epidemiology and Public Health, University College London, London, UK