From the aFinnish Institute of Occupational Health, Centre of Expertise for Health and Work Ability, Helsinki, Finland; bDepartment of Occupational and Environmental Medicine, Bispebjerg Hospital University of Copenhagen, Copenhagen, Denmark; cDepartment of Occupational Medicine and Epidemiology, National Institute of Occupational Health, Oslo, Norway; and dInstitute of Health and Society, University of Oslo, Oslo, Norway.
The authors report no conflicts of interest.
Correspondence: Markku Sallmén, Finnish Institute of Occupational Health, P.O. Box 40, FI-00251, Helsinki, Finland. E-mail: firstname.lastname@example.org.