Funding for this research was provided by:
National Institute for Occupational Safety and Health (3TC42OH008414, t42/cct810426-10, 1 U 01 OH007917-01)
Received: 22 May 2018
Accepted: 24 October 2018
First Online: 23 November 2018
Ethics approval and consent to participate
: The workers were not incentivized to participate, but were paid normal wages during the study. All participants signed informed consent documents. The WISTAH study was approved by the Institutional Review Boards of the University of Wisconsin-Milwaukee and the University of Utah (#03.02.059 and 11,889, respectively).
: Not applicable.
: The authors declare that they have no competing interest.
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