Queen Mary University of London - Institute of Population Health Sciences, Queen Mary University of London - Institute of Population Health Sciences, Queen Mary University of London - Institute of Population Health Sciences, Queen Mary University of London - Institute of Population Health Sciences, Jane Symons Media, Queen Mary University of London - Institute of Population Health Sciences, King’s College London - Institute of Psychiatry, Psychology & Neuroscience (IoPPN), King’s College London - Institute of Psychiatry, Psychology & Neuroscience (IoPPN), King’s College London - Institute of Psychiatry, Psychology & Neuroscience (IoPPN), Queen Mary University of London - Institute of Population Health Sciences, Queen Mary University of London - Institute of Population Health Sciences, Queen Mary University of London - Institute of Population Health Sciences, Queen Mary University of London - Institute of Population Health Sciences, Queen Mary University of London - Institute of Population Health Sciences, Queen Mary University of London - Institute of Population Health Sciences, Queen Mary University of London - Institute of Population Health Sciences, Queen Mary University of London - Institute of Population Health Sciences, London School of Hygiene & Tropical Medicine - Department of Health Services Research and Policy, Imperial College London - National Heart and Lung Institute, Edenfield Road Surgery, Queen Mary University of London - Institute of Population Health Sciences, Queen Mary University of London - Institute of Population Health Sciences, Swansea University - Swansea University Medical School, Swansea University - Population Data Science, Queen Mary University of London - Asthma UK Centre for Applied Research, Queen's University Belfast, University of Edinburgh - Usher Institute, King’s College London - Institute of Psychiatry, Psychology & Neuroscience (IoPPN), Queen Mary University of London - Institute of Population Health Sciences and Queen Mary University of London - Barts and The London School of Medicine and Dentistry