1. Division of Clinical Neurosciences, Centre for Clinical Brain Sciences, University of Edinburgh, Edinburgh, Scotland
2. Institute for Ageing and Health, Newcastle University, Newcastle-upon-Tyne, England
3. Division of Applied Health Sciences, University of Aberdeen, Aberdeen, Scotland
4. Institute of Neurological Sciences, Southern General Hospital, Glasgow, Scotland
5. Department of Neurosurgery, Leiden University Medical Center, Leiden, the Netherlands
6. Department of Clinical Neurosciences, University of Calgary, Calgary, Alberta, Canada
7. University College London Institute for Global Health, London, England