1. Research Department of Primary Care and Population Health, University College London, London, UK
2. Department of Health Sciences, University of York, Heslington, York, UK
3. Cardiovascular Epidemiology Unit, Department of Public Health and Primary Care, University of Cambridge, Cambridge, UK
4. Whittington Hospital, Whittington Health NHS Trust, London, UK
5. Department of Psychology, University of Southampton, Southampton, UK
6. Centre for Behaviour Change, Research Department of Clinical, Educational and Health Psychology, University College London, London, UK
7. Faculty of Health Sciences, University of Southampton, Southampton, UK
8. Community Health Sciences Department, College of Applied Medical Sciences, King Saud University, Riyadh, Saudi Arabia
9. Patient Access to Electronic Records Systems Ltd (PAERS), Evergreen Life, Manchester, UK
10. Nuffield Department of Primary Care Health Sciences, University of Oxford, Oxford, UK