1. Faculty of Epidemiology and Population Health, London School of Hygiene & Tropical Medicine, London, UK
2. School of Social and Community Medicine, University of Bristol, Bristol, UK
3. Institute for Global Health, University College London, London, UK
4. Public Health England, London, UK
5. Whittington Health, St Ann’s Hospital, London, UK
6. Royal Free London NHS Foundation Trust, London, UK
7. University College London Respiratory, Division of Medicine, University College London, London, UK