1 Center for Infectious Disease Epidemiology and Research, School of Public Health and Family Medicine, University of Cape Town, Cape Town, South Africa.
2 Médecins Sans Frontières, Paris.
3 Médecins Sans Frontières, South Africa.
4 Harvard Medical School, Department of Global Health and Social Medicine, Boston, MA, USA <email></email>, Email: jennifer_furin@hms.harvard.edu.