1. Institute for Applied Clinical Sciences, Keele University, Keele, UK
2. Keele University, Keele, UK
3. University of Birmingham, Birmingham, UK
4. Health Economics Unit, University of Birmingham, Birmingham, UK
5. University of Oxford, Oxford, UK
6. Royal Wolverhampton NHS Trust, Wolverhampton, UK
7. Neurosciences Department, Royal Stoke University Hospital, Stoke-on-Trent, UK