1. Department of Public Health, Environments and Society, Faculty of Public Health and Policy, London School of Hygiene & Tropical Medicine, London, UK
2. Department of Paediatric Haematology, King’s College Hospital, London, UK
3. University College London NHS Hospitals Foundation Trust, London, UK
4. National Heart and Lung Institute, Imperial College London, London, UK
5. Collaboration for Leadership in Applied Health Research and Care for Northwest London, Imperial College London, London, UK