1. Department of Medicine, Charlotte Maxeke Johannesburg Academic Hospital, Parktown, South Africa
2. Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
3. Unit for Undergraduate Medical Education, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
4. Division of Rheumatology, Department of Medicine, Chris Hani Baragwanath Academic Hospital, Johannesburg, South Africa