1. Critical Care Research Group, Adult Intensive Care Services, The Prince Charles Hospital, Brisbane, Australia
2. Physiotherapy Department, The Prince Charles Hospital, Brisbane, Australia
3. Cardiac Surgery Critical Care Unit, Institut Clinic Cardiovascular, Hospital Clínic, Barcelona, Spain
4. Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain
5. Department of Physiotherapy, St. Vincent's Hospital, Sydney, Australia
6. Department Rehabilitation Sciences, University of Leuven, University Hospitals Leuven, Belgium