1. London School of Hygiene & Tropical Medicine, London, UK
2. Institute of Cardiovascular and Medical Sciences, University of Glasgow, Glasgow, UK
3. Institute of Health Sciences, University of Leeds, Leeds, UK
4. Monklands Hospital, NHS Lanarkshire, Glasgow, UK
5. Department of Ageing and Health, Guy’s & St Thomas’ NHS Foundation Trust, London, UK
6. Nuffield Department of Population Health, University of Oxford, Oxford, UK