1. School of Public Health, Imperial College London, London, United Kingdom
2. Department of Paediatric Allergy, Imperial College Healthcare NHS Trust, London, United Kingdom
3. Department of Primary Care and Population Health, University of Nicosia Medical School, Nicosia, Cyprus
4. Centre for Evidence-Based Healthcare, School of Medicine, University of Nottingham, Nottingham, United Kingdom
5. Department of International Health, Johns Hopkins University, Baltimore, Maryland
6. Population Health Research Institute, St George’s, University of London, London, United Kingdom
7. National Heart and Lung Institute, Imperial College London, London, United Kingdom