About the Authors
Finnish Institute of Occupational Health, Helsinki, Finland
Population Research Unit, Department of Social Research, University of Helsinki, Helsinki, Finland
Department of Public Health, University of Turku and Turku University Hospital, Turku, Finland
Department of Epidemiology and Public Health, University College London, London, United Kingdom
Department of Behavioral Sciences, University of Helsinki, Helsinki, Finland
The authors have declared that no competing interests exist.
Conceived and designed the experiments: KH PM JV MK. Analyzed the data: KH. Wrote the first draft of the manuscript: KH. Contributed to the writing of the manuscript: KH PM JV MK. ICMJE criteria for authorship read and met: KH PM JV MK. Agree with manuscript results and conclusions: KH PM JV MK. Formulated the hypothesis: KH MK.