1 Centre for Primary Care and Public Health, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London E1 4NS, UK. Electronic address: j.kennedy@qmul.ac.uk.
2 Centre for Primary Care and Public Health, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London E1 4NS, UK.
3 Centre for Humanitarian Leadership, Deakin University Melbourne, Burwood, VIC, Australia; Faculty of Health Sciences, American University Beirut, Beirut, Lebanon; The Lancet-American University Beirut Commission on Syria.
4 Faculty of Health Sciences, American University Beirut, Beirut, Lebanon; The Lancet-American University Beirut Commission on Syria.