1. Finnish Institute of Occupational Health; Helsinki/Kuopio Finland
2. University of Turku, Department of Public Health; and Turku University Hospital; Turku Finland
3. University of Tampere; Faculty of Social Sciences (Health Science); Tampere Finland
4. Harvard T. H. Chan School of Public Health; Boston Massachusetts USA
5. Department of Public Health, Faculty of Medicine; University of Helsinki; Helsinki Finland
6. Department of Epidemiology and Public Health; University College London Medical School; UK