affiliation not provided to SSRN, Canadian Memorial Chiropractic College, University of Manitoba, University of Manitoba, affiliation not provided to SSRN, Canadian Memorial Chiropractic College, University of Toronto - Unity Health Toronto, University of Manitoba, University of Manitoba, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, Government of Canada - Health Canada, affiliation not provided to SSRN, Canadian Memorial Chiropractic College and affiliation not provided to SSRN