Cooper, Catherine G.
Lupo, Karen D.
Zena, Ashenafi G.
Schmitt, Dave N.
Richards, Michael P.
Funding for this research was provided by:
Social Sciences and Humanities Research Council of Canada
Natural Sciences and Engineering Research Council of Canada
University of British Columbia
Article History
Received: 7 February 2018
Accepted: 19 October 2018
First Online: 20 November 2018
Compliance with ethical standards
: The proposal for this study was submitted to the IRB ethics board at Southern Methodist University in December 2012 and accepted. Individuals who provided hair samples for this study confirmed their understanding of the study and gave verbal consent.
: The authors declare that they have no conflict of interest.