1. Nursing & Health Care School, University of Glasgow, Glasgow, UK
2. Institute of Cardiovascular and Medical Sciences, University of Glasgow, Glasgow, UK
3. Department of Medicine for the Elderly, Glasgow Royal Infirmary, NHS Greater Glasgow and Clyde, Glasgow, UK
4. Department of Geriatric Medicine, University of Edinburgh, Edinburgh, UK
5. Department of Medicine for the Elderly, Monklands Hospital, NHS Lanarkshire, Airdrie, UK