1. Nuffield Department of Primary Care Health Sciences, University of Oxford, Oxford, UK
2. Nuffield Department of Population Health, University of Oxford, Oxford, UK
3. National Institute for Health and Care Excellence, Manchester, UK
4. Department of Health Sciences, University of Leicester, Leicester, UK
5. Primary Care Clinical Sciences, University of Birmingham, Birmingham, UK
6. National Nursing Research Unit, Florence Nightingale School of Nursing and Midwifery, King’s College London, London, UK
7. National Clinical Guideline Centre, London, UK
8. School of Social and Community Medicine, University of Bristol, Bristol, UK
9. Patient and Public Involvement Programme, National Institute for Health and Care Excellence, London, UK