1. Division of Rehabilitation and Ageing, University of Nottingham, Nottingham, UK
2. Nottingham Clinical Trials Unit, University of Nottingham, Nottingham, UK
3. Division of Clinical Neuroscience, University of Nottingham, Nottingham, UK
4. School of Health Sciences, University of Nottingham, Nottingham, UK
5. Swansea Centre for Health Economics, Swansea University, Swansea, UK
6. Institute of Mental Health, Nottingham, UK