1. University of York; Department of Health Sciences; Heslington York North Yorkshire UK Y010 5DD
2. University of Edinburgh; Centre for Cognitive Ageing and Cognitive Epidemiology and the Alzheimer Scotland Dementia Research Centre; Department of Geriatric Medicine, The Royal Infirmary of Edinburgh, Room S1642 51 Little France Crescent Edinburgh UK EH16 4SB
3. University of Leeds; Academic Unit of Elderly Care and Rehabilitation; Bradford Institute for Health Research Bradford UK BD9 6RJ
4. Bradford Institute for Health Research, Bradford Teaching Hospitals NHS Foundation Trust/University of Leeds; Academic Unit of Elderly Care and Rehabilitation; Bradford UK
5. Bradford Teaching Hospitals NHS Foundation Trust; Department of Anaesthesia; Bradford UK BD9 6RJ