1. Population Health Sciences, Bristol Medical School, University of Bristol, Bristol, United Kingdom
2. Department of Applied Statistics, Helwan University, Cairo, Egypt
3. Population Health and Occupational Disease, NHLI, Imperial College London, London, United Kingdom
4. ISGlobal, Barcelona, Spain
5. Pompeu Fabra University, Barcelona, Spain
6. CIBER Epidemiología y Salud Pública, Barcelona, Spain
7. Human Development and Health, Faculty of Medicine, University of Southampton, Southampton, United Kingdom; and
8. Department of Paediatrics, Imperial College, London, United Kingdom