1. Hubert Department of Global Health, Rollins School of Public Health, Emory University, Atlanta, GA, USA
2. McCord Hospital, Durban, South Africa
3. Centre for Occupational and Environmental Health, University of KwaZulu-Natal, Durban, South Africa
4. School of Development Studies, University of KwaZulu-Natal, Durban, South Africa
5. Infectious Disease Division, Department of Medicine, Emory University School of Medicine, Atlanta, GA, USA