1. Department of Pathology, Stanford University School of Medicine, Stanford, California, USA
2. Research Institute of the McGill University Health Centre, Montreal, Quebec, Canada
3. McGill International TB Centre, Montreal, Quebec, Canada
4. Clinical Microbiology Laboratory, Stanford Health Care, Stanford, California, USA
5. Department of Epidemiology, Biostatistics and Occupational Health, McGill University, Montreal, Quebec, Canada
6. Division of Infectious Diseases and Geographic Medicine, Stanford University School of Medicine, Stanford, California, USA