1 Academic Department of Paediatrics, Faculty of Medicine, Imperial College London, United Kingdom Desmond Tutu TB Centre, Department of Paediatrics and Child Health, Faculty of Medicine and Health Sciences, Stellenbosch University Academic Department of Paediatrics, Faculty of Medicine, Imperial College London, United Kingdom Desmond Tutu TB Centre, Department of Paediatrics and Child Health, Faculty of Medicine and Health Sciences, Stellenbosch University, Tygerberg Children's Hospital Desmond Tutu TB Centre, Department of Paediatrics and Child Health, Faculty of Medicine and Health Sciences, Stellenbosch University, Tygerberg, South Africa.