1. Department of Interdisciplinary Health Sciences, Faculty of Health Sciences, Stellenbosch University, Cape Town, South Africa
2. Faculty of Kinesiology and Rehabilitation Sciences, Katholieke Universiteit Leuven, Tervuursevest, Leuven, Belgium
3. Department of Physical Therapy, Faculty of Medicine, University of British Columbia, Vancouver, British Columbia, Canada
4. Physiotherapy Department, Faculty of Health Sciences, University of the Witwatersrand, Parktown, South Africa
5. Department of Physiotherapy, Medical School, University of the Witwatersrand, Parktown, South Africa
6. Cardio-Thoracic Department, University Hospital Pisa, Weaning Centre–Auxilium Vitae Volterra, Italy