1. Division of Clinical Pharmacology, Department of Medicine, University of Cape Town , Cape Town , South Africa
2. Wellcome Centre for Infectious Diseases Research in Africa, Institute of Infectious Disease and Molecular Medicine, University of Cape Town , Cape Town , South Africa
3. HIV Mental Health Research Unit, Division of Neuropsychiatry, Department of Psychiatry and Mental Health, University of Cape Town , Cape Town , South Africa
4. Ezintsha, Wits Reproductive Health and HIV Institute, Faculty of Health Sciences, University of the Witwatersrand , Johannesburg , South Africa
5. Department of Medicine, Vanderbilt University Medical Center , Nashville, TN , USA
6. Department of Internal Medicine, Meharry Medical College , Nashville, TN , USA