1. Academic Unit of Elderly Care and Rehabilitation, Bradford Teaching Hospitals NHS Foundation Trust, Bradford, UK
2. Leeds Neurophysiotherapy, Leeds, UK
3. Clinical Trials Research Unit, University of Leeds, Leeds, UK
4. Academic Unit of Elderly Care and Rehabilitation, Bradford Teaching Hospitals NHS Foundation Trust and University of Leeds, Bradford, UK
5. Health Economics Group, Institute of Health Research, University of Exeter, Exeter, UK
6. Academic Unit of Health Economics, Leeds Institute of Health Sciences, University of Leeds, Leeds, UK