1. Division of Physiotherapy, University of Cape Town, Cape Town, South Africa
2. Centre for Medical Ethics and Law, Faculty of Medicine and Health Sciences, Stellenbosch University, Cape Town, South Africa
3. Department of Sport and Exercise Science, LUNEX International University of Health, Exercise and Sports, Differdange, Luxembourg
4. Luxembourg Health & Sport Sciences Research Institute A.s.b.l., Differdange, Luxembourg