1. Lifespan and Population Sciences, School of Medicine, University of Nottingham, Nottingham NG7 2RD, UK
2. Department of Respiratory Sciences, University of Leicester, Leicester LE1 7RH, UK
3. Public Health Institute, Faculty of Health, Liverpool John Moores University, Liverpool L3 5UX, UK
4. Research Department of Medical Education, UCL Medical School, London WC1E 6DE, UK
5. Department of Sociology, School of Social Sciences, University of Manchester, Manchester M13 9PL, UK
6. Department of Infectious Diseases, London North West University Healthcare NHS Trust, London UB1 3HW, UK
7. The National Hospital for Neurology and Neurosurgery, London WC1N 3BG, UK
8. The David Evans Medical Research Centre, Nottingham University Hospital NHS Trust, Nottingham NG5 1PB, UK