1. Medical Spinal Research Unit, Spine Centre of Southern Denmark, University Hospital of Southern Denmark, Middelfart, Denmark
2. Department of Regional Health Research, University of Southern Denmark, Odense, Denmark
3. Center for Muscle and Joint Health, Department of Sports Science and Clinical Biomechanics, University of Southern Denmark, Odense, Denmark
4. Schroeder Arthritis Institute, Krembil Research Institute, University Health Network, Toronto, Canada