1. Health Services & Policy Research Group, Exeter Collaboration for Academic Primary Care (APEx) (Person centerd Care), University of Exeter Medical School, University of Exeter, Exeter, UK
2. Nuffield Department of Population Health, University of Oxford, Oxford, UK
3. Nuffield Department of Primary Care Health Sciences, University of Oxford, Oxford, UK
4. Primary Care Unit, Cambridge Center for Health Services Research, University of Cambridge, UK
5. The Psychometrics Centre, Judge Business School, University of Cambridge, UK
6. Department of Health Services Research & Policy, London School of Hygiene & Tropical Medicine, London, UK
7. School of Sociology & Social Policy, University of Leeds, Leeds, UK