1. Center for the AIDS Program of Research in South Africa (CAPRISA), Nelson R Mandela School of Medicine, University of KwaZulu Natal, Durban, South Africa
2. Discipline of Pharmacology, College of Health Sciences, University of KwaZulu-Natal, Durban, South Africa
3. Division of Infectious Diseases, Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, USA
4. MRC-CAPRISA HIV-TB Pathogenesis and Treatment Research Unit, Doris Duke Medical Research Institute, University of KwaZulu-Natal, Durban, South Africa