1. Faculty of Health Sciences, Department of Medicine, University of Cape Town, Cape Town, South Africa
2. Office of Research and Development, University of Botswana, Gaborone, Botswana
3. Botswana-Baylor Children’s Clinical Centre of Excellence, Gaborone, Botswana
4. Faculty of Health Sciences and Groote Schuur Hospital, Cape Town, South Africa
5. Baylor College of Medicine, Houston, TX, USA