1. Centre for Evidence Based Medicine, University of Oxford, Oxford, UK
2. Norfolk and Norwich University Teaching Hospital NHS Trust, Norwich, UK
3. Stroke Research Group, Institute of Neuroscience, Newcastle University, Newcastle upon Tyne, UK
4. School of Health, Community and Education Studies, Northumbria University, London, UK
5. John Radcliffe Hospital, Oxford University Hospitals NHS Trust, Oxford, UK
6. Radcliffe Department of Medicine, University of Oxford, Oxford, UK
7. Acute Stroke Programme, Radcliffe Department of Medicine, University of Oxford, Oxford, UK
8. Acute Vascular Imaging Centre, John Radcliffe Hospital, University of Oxford, Oxford, UK