Funding for this research was provided by:
NIH - National Center for Complimentary and Alternative Medicine (R00AT004983)
Received: 9 May 2019
Accepted: 23 December 2019
First Online: 24 January 2020
Ethics approval and consent to participate
: Each participant provided written, informed consent prior to beginning data collection. The protocols for this investigation were approved by the Colorado Multiple Institutional Review Board. Each participant provided written, informed consent before the start of each data collection session. Data analysis procedures were approved by the Canadian Memorial Chiropractic College’s Research Ethics Board.
: Written consent was obtained from the individuals shown in all published images.
: The authors declare that they have no competing interests.