1. Division of Rehabilitation and Ageing, University of Nottingham, Nottingham, UK
2. East Midlands Research Design Service, University of Nottingham, Nottingham, UK
3. Division of Primary Care, University of Nottingham, Nottingham, UK
4. Gateshead PCT, Gateshead Health NHS Foundation Trust, Gateshead, UK
5. Faculty of Medicine and Health Sciences, University of East Anglia, Norwich, UK
6. United Lincolnshire Hospitals NHS Trust, Lincoln, UK
7. Institute of Work, Health and Organisations, University of Nottingham, Nottingham, UK
8. Nottingham Clinical Trials Unit, University of Nottingham, Nottingham, UK
9. Service user living in Nottingham, ,