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Additional Information

Competing Interests

Annika K Jägerbrand is an employee of the Swedish National Road and Transport Research Institute.

Author Contributions

Juha M Alatalo conceived and designed the experiments, performed the experiments, contributed reagents/materials/analysis tools, wrote the paper, reviewed drafts of the paper.

Annika K Jägerbrand performed the experiments, analyzed the data, prepared figures and/or tables, reviewed drafts of the paper.

Ulf Molau conceived and designed the experiments, performed the experiments, contributed reagents/materials/analysis tools, reviewed drafts of the paper.

Funding

This study was supported by Oscar och LiIli Lamms Minne to JMA. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.


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