1. Medical 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. School of Allied Health, University of Limerick, Limerick, Ireland
4. Ageing Research Centre, Health Research Institute, University of Limerick, Limerick, Ireland
5. Sports and Human Performance Research Centre, Health Research Institute, University of Limerick, Limerick, Ireland
6. Faculty of Health Sciences, University of Southern Denmark, Odense, Denmark
7. Department of Sports Science and Biomechanics, University of Southern Denmark, Odense, Denmark