1. National Institute for Health Research (NIHR) School for Primary Care Research, Nuffield Department of Primary Care Health Sciences, University of Oxford, Oxford, United Kingdom
2. Primary Care Unit, Strangeways Research Laboratory, Department of Public Health and Primary Care, University of Cambridge, Cambridge, United Kingdom
3. Primary Care Clinical Sciences, NIHR School for Primary Care Research, University of Birmingham, Birmingham, Edgbaston, Birmingham, United Kingdom
4. School of Psychology, University of Central Lancashire, Preston, Lancashire, United Kingdom
5. Centre for Clinical Epidemiology and Evaluation, Vancouver Coastal Health Research Institute, Vancouver, British Columbia, Canada6School of Population and Public Health, University of British Columbia, Vancouver, British Columbia, Canada
6. Health Economics Unit, School of Health and Population Sciences, University of Birmingham, Edgbaston, Birmingham, United Kingdom
7. School of Medicine, University of Southampton, Southampton, United Kingdom
8. Institute of Cardiovascular Sciences, NIHR University College London Hospitals Biomedical Research Centre, University College London, London, United Kingdom