1. Division of Infectious Diseases, Department of Medicine, Vanderbilt University School of Medicine, Nashville, Tennessee, USA
2. KwaZulu-Natal Research Institute for TB and HIV, Durban
3. eThekwini Municipality, Durban, South Africa
4. Department of Biostatistics, Vanderbilt University School of Medicine, Nashville, Tennessee, USA
5. Department of Infectious Diseases, Division of Internal Medicine, Nelson R Mandela School of Medicine, University of KwaZulu-Natal, Durban, South Africa