1. Alzheimer Scotland Dementia Research Centre, University of Edinburgh, Edinburgh, UK
2. Centre for Cognitive Ageing and Cognitive Epidemiology, University of Edinburgh, Edinburgh, UK
3. Department of Medicine for the Elderly, NHS Lothian, Edinburgh, UK
4. School of Applied Social Science, University of Stirling, Stirling, UK
5. Geriatric Medicine, University of Edinburgh, Edinburgh, UK
6. Institute of Cardiovascular and Medical Sciences, University of Glasgow, Glasgow, UK