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Funding
Funding for this research was provided by:
Alpha Foundation for the Improvement of Mine Safety and Health (AFC719-15)
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Article History
Received: 22 May 2020
Accepted: 30 November 2020
First Online: 8 January 2021
Compliance with Ethical Standards
:
: On behalf of all authors, the corresponding author states that there is no conflict of interest.
: The findings and conclusions in this report are those of the author(s) and do not necessarily represent the official position of the National Institute for Occupational Safety and Health, Centers for Disease Control and Prevention. Mention of any company or product does not constitute endorsement by NIOSH.
