1. Center for Tuberculosis Research, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
2. Public Health Research Institute, New Jersey Medical School, Rutgers, The State University of New Jersey, New Jersey, USA
3. Tufts University School of Medicine, Department of Molecular Biology and Microbiology, Boston, Massachusetts, USA
4. Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA