1 Montreal Chest Institute, McGill University Health Center Research Institute, McGill University, Montreal, QC H4A 3S5, Canada. Electronic address: dick.menzies@mcgill.ca.
2 Montreal Chest Institute, McGill University Health Center Research Institute, McGill University, Montreal, QC H4A 3S5, Canada.
3 WHO Collaborating Centre for Tuberculosis and Lung Diseases, Maugeri Care and Research Institute, Tradate, Italy.
4 Division of Pulmonary and Critical Care Medicine, University of California, San Francisco, CA, USA.
5 Heartland National TB Center, University of Texas Health Science Center at Tyler, Tyler, TX, USA.