About the Authors

Martha Van der Walt

vdwalt@mrc.ac.za

Affiliation Tuberculosis Epidemiology and Intervention Research Unit, South African Medical Research Council, Pretoria, South Africa

Johanna Lancaster

Affiliation Tuberculosis Epidemiology and Intervention Research Unit, South African Medical Research Council, Pretoria, South Africa

Ronel Odendaal

Affiliation Tuberculosis Epidemiology and Intervention Research Unit, South African Medical Research Council, Pretoria, South Africa

Jeanne Garcia Davis

Affiliation Johns Hopkins University School of Nursing, Baltimore, Maryland, United States of America

Karen Shean

Affiliation Tuberculosis Epidemiology and Intervention Research Unit, South African Medical Research Council, Pretoria, South Africa

Jason Farley

Affiliation Johns Hopkins University School of Nursing, Baltimore, Maryland, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Collected the data: JL. Conceived and designed the experiments: MVdW. Performed the experiments: JL. Analyzed the data: RO JL MVdW KS JF. Contributed reagents/materials/analysis tools: RO. Wrote the paper: MVdW JD KS JL JF.