1 Dept of Medicine, University of California San Francisco, San Francisco, CA, USA cecily.miller@ucsf.edu.
2 Global TB Programme, World Health Organization, Geneva, Switzerland.
3 University of Sassari Medical School, Dept of Biomedical Sciences, Sassari, Italy.
4 World Health Organization Collaborating Centre for Tuberculosis and Lung Diseases, Fondazione S. Maugeri, Care and Research Institute, Tradate, Italy.