1. Department of Public Health, University of Turku and Turku University Hospital, Turku, Finland
2. Centre for Population Health Research, University of Turku and Turku University Hospital, Turku, Finland
3. Department of Psychology and Speech-Language Pathology, University of Turku, Turku, Finland
4. Finnish Institute of Occupational Health, Helsinki, Finland
5. Clinicum, Faculty of Medicine, University of Helsinki, Helsinki, Finland