Article History
Received: 7 December 2018
Accepted: 9 April 2019
First Online: 17 May 2019
Compliance with Ethical Standards
:
: The findings and conclusions in this paper are those of the authors 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 of NIOSH.
: The authors declare that they have no conflict of interest.