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Linked article: 064220
Funding This work was supported by the US National Institute for Occupational Safety and Health, with no involvement in study design, collection, analysis and interpretation of data, writing the report or in the decision to submit the paper for publication. The findings and conclusions in this article are those of the author and do not necessarily represent the views of the US National Institute for Occupational Safety and Health.
Competing interests None.
Provenance and peer review Commissioned; internally peer reviewed.