1 MRC Centre for Global Infectious Disease Analysis, Abdul Latif Jameel Institute for Disease and Emergency Analytics (J-IDEA), Imperial College London, London, UK.
2 Department of Infectious Disease Epidemiology, Faculty of Epidemiology and Population Health, London School of Hygiene and Tropical Medicine, London, UK.
3 Syria Research Group (SyRG), co-hosted by the London School of Hygiene and Tropical Medicine, London, UK; and Saw Swee Hock School of Public Health, Singapore.
4 Eijkman-Oxford Clinical Research Unit, Jakarta, Indonesia.