About the Authors
Center for Tuberculosis Research, Division of Infectious Diseases, Johns Hopkins University School of Medicine, Baltimore, Maryland, United States of America
The authors have declared that no competing interests exist.
Conceived and designed the experiments: DVA PJC JHG. Performed the experiments: DVA PJC SL ST. Analyzed the data: DVA PJC ELN JHG. Contributed reagents/materials/analysis tools: DVA JHG. Wrote the paper: DVA JHG.