1. Department of Sports Science and Clinical Biomechanics; Faculty of Health; University of Southern Denmark; Odense Denmark
2. Nordic Institute of Chiropractic and Clinical Biomechanics; Odense Denmark
3. Division of Epidemiology; Dalla Lana School of Public Health; University of Toronto; Toronto ON Canada
4. Division of Health Care and Outcomes Research; Krembil Research Institute; University Health Network; Toronto ON Canada