1. Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland;
2. DST/NRF Centre of Excellence for Biomedical Tuberculosis Research and SAMRC Centre for Tuberculosis Research, Division of Molecular Biology and Human Genetics, Faculty of Medicine and Health Sciences, Stellenbosch University, Tygerberg, South Africa; and
3. Division of Infectious Diseases, Johns Hopkins University School of Medicine, Baltimore, Maryland