1. Department of Non-Communicable Disease Epidemiology, London School of Hygiene and Tropical Medicine, London, UK
2. York Trials Unit, York University, York, UK
3. Clinical Practice Research Datalink, Medicines and Healthcare products Regulatory Agency, London, UK
4. Division of Primary Care and Public Health, Brighton and Sussex Medical School, University of Brighton, Brighton, UK
5. The Wolfson Centre for Personalised Medicine, Institute of Translational Medicine, University of Liverpool, Liverpool, UK
6. Department of Primary Care and Public Health Sciences Division of Health and Social Care Research, King’s College London, London, UK
7. The Health Centre, Bicester, UK
8. Barns Medical Practice, Ayr, UK
9. Primary Care and Public Health Sciences, King’s College London, London, UK