Assisted with article writing. This project was funded with Federal funds from the National Institute of Allergy and Infectious Diseases, National Institutes of Health, Department of Health and Human Services, under Contract no. HHSN2722000900050C (`TB Clinical Diagnostics Research Consortium'), and under grant # K23AI089259.Int. J. Environ. Res. Public Health 2011, 8, 2524-2532; doi:10.3390