1. Finnish Institute of Occupational Health, Helsinki, Finland
2. Division of Insurance Medicine, Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden
3. Clinicum, Faculty of Medicine, University of Helsinki, Helsinki, Finland
4. Department of Epidemiology and Public Health, University College London, London, UK
5. School of Medicine, Institute of Public Health and Clinical Nutrition, University of Eastern Finland, Kuopio, Finland