1. Division of Internal Medicine, Faculty of Health Sciences, School of Clinical Medicine, University of Witwatersrand, Johannesburg, South Africa
2. Department of Rheumatology, Charlotte Maxeke Johannesburg Academic Hospital, Johannesburg, South Africa
3. Department of Pulmonology, Charlotte Maxeke Johannesburg Academic Hospital, Johannesburg, South Africa
4. Division of Nuclear Medicine, Faculty of Health Sciences, School of Clinical Medicine, University of Witwatersrand, Johannesburg, South Africa
5. Department of Nuclear Medicine, Charlotte Maxeke Johannesburg Academic Hospital, Johannesburg, South Africa