1 Department of Psychiatry, Faculty of Medicine and Health Sciences, Stellenbosch University, Cape Town, 7505, South Africa. Electronic address: laila@sun.ac.za.
2 Division of Clinical Pharmacology, Department of Medicine and Division of Epidemiology and Biostatistics, and Department of Global Health, Stellenbosch University, Cape Town, 7505, South Africa; Health Systems Research Unit, South African Medical Research Council, Cape Town, South Africa.