1. Department of Epidemiology, Brown University School of Public Health, Providence, RI, USA;
2. Desmond Tutu TB Centre, Department of Paediatrics and Child Health, Faculty of Medicine and Health Sciences, Stellenbosch University, Cape Town, South Africa;
3. Partners in Health, Lima, Peru;
4. Desmond Tutu TB Centre, Department of Paediatrics and Child Health, Faculty of Medicine and Health Sciences, Stellenbosch University, Cape Town, South Africa;, Department of Infectious Disease, Imperial College London, London, UK;
5. Division of Pediatric Infectious Diseases, Department of Pediatrics, Alpert Medical School of Brown University, Providence, RI, Center for International Health Research, Rhode Island Hospital, Providence, RI, USA