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 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.
6 Center for International Health Research, Rhode Island Hospital, Providence, RI, USA.