1. National Capital Consortium, Walter Reed National Military Medical Center , Bethesda, Maryland , USA
2. Department of Epidemiology, School of Public Health, Boston University , Boston, Massachusetts , USA
3. South African Tuberculosis Vaccine Initiative, Institute of Infectious Disease and Molecular Medicine, and Division of Immunology, Department of Pathology, University of Cape Town , Cape Town , South Africa
4. Department of Pediatrics and Child Health, Red Cross War Memorial Children's Hospital and SA-MRC Unit on Child & Adolescent Health, University of Cape Town , Cape Town , South Africa
5. Division of Infectious Diseases and Geographic Medicine, Stanford University School of Medicine , Stanford, California , USA