Funding for this research was provided by:
Text and Data Mining valid from 2019-05-24
Received: 4 March 2019
Accepted: 19 May 2019
First Online: 24 May 2019
Ethics approval and consent to participate
: The study design and its procedures were approved by the Western Washington University Institutional Review Board. All participants completed an informed consent form prior to their participation in this study.
: Not applicable.
: The authors declare that they have no competing interests.