1 Médecins Sans Frontières, Khayelitsha, South Africa.
2 Médecins Sans Frontières, Khayelitsha, South Africa, Division of Public Health Medicine, School of Public Health and Family Medicine, University of Cape Town, Cape Town, South Africa.
3 Department of Global Health and Social Medicine, Harvard Medical School, Boston, MA, USA.
4 City of Cape Town, Department of Health, Cape Town, South Africa.