1. Department of Paediatrics and Child Health, Faculty of Health Science, Stellenbosch University, Cape Town, South Africa
2. Desmond Tutu TB Centre, Department of Paediatrics and Child Health, Faculty of Health Science, Stellenbosch University, Cape Town, South Africa
3. Faculty of Health Science, Stellenbosch University, Cape Town, South Africa; and Desmond Tutu TB Centre, Department of Paediatrics and Child Health, Faculty of Health Science, Stellenbosch University, Cape Town, South Africa