1. Division of Psychiatry, UCL , London , United Kingdom of Great Britain and Northern Ireland ;
2. Research Department of Behavioural Science and Health, UCL, Institute of Epidemiology & Health Care , London , United Kingdom of Great Britain and Northern Ireland ;
3. Camden and Islington NHS Foundation Trust , London , United Kingdom of Great Britain and Northern Ireland ;
4. Centre for Applied Dementia Studies, University of Bradford , Bradford , United Kingdom of Great Britain and Northern Ireland ;
5. Division of Psychiatry, UCL Marie Curie Palliative Care Research Unit , London , United Kingdom of Great Britain and Northern Ireland ;
6. Statistical Sciences, UCL , London , United Kingdom of Great Britain and Northern Ireland ;
7. Priment Clinical Trials Unit, UCL , London , United Kingdom of Great Britain and Northern Ireland ;
8. MRC Unit for Lifelong Health and Aging, UCL , London , United Kingdom of Great Britain and Northern Ireland ;
9. Department of Psychiatry and Behavioural Sciences, UC Davis , Davis , CA , USA ;
10. Alzheimer’s Society Research Network Volunteers , London , United Kingdom of Great Britain and Northern Ireland