1. Finnish Institute of Occupational Health, Helsinki, Finland
2. Department of Public Health, University of Turku and Turku University Hospital, Turku, Finland
3. Centre for Psychiatry, Wolfson Institute of Preventive Medicine, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, United Kingdom
4. Department of Environmental Health, National Institute for Health and Welfare, Kuopio, Finland
5. Department of Psychology, University of Turku, Turku, Finland
6. Department of Epidemiology and Public Health, University College of London, London, United Kingdom