1. Population Health Sciences University of Bristol Bristol UK
2. Primary Care, Population Sciences and Medical Education University of Southampton Southampton UK
3. Centre of Evidence Based Dermatology University of Nottingham Nottingham UK
4. Bristol Royal Hospital for Children University Hospitals Bristol NHS Foundation Trust Bristol UK
5. Bristol Randomised Trials Collaboration, Bristol Trials Centre University of Bristol Bristol UK
6. Health Economics Bristol, Population Health Sciences University of Bristol Bristol UK
7. Nottingham City Care Partnership Nottingham UK
8. Division of Primary Care University of Nottingham Nottingham UK
9. National Heart and Lung Institute Imperial College London London UK