Text and Data Mining valid from 2019-04-02
Received: 10 December 2018
Accepted: 25 February 2019
First Online: 2 April 2019
Compliance with Ethical Standards
: 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.
: The authors declare that they have no conflict of interest.