1 Department of Pediatrics, Baylor College of Medicine, Houston, TX, USA.
2 McGill International TB Centre, McGill University, Montréal, QC, Respiratory Epidemiology and Clinical Research Unit, Montréal Chest Institute, McGill University Health Centre, Montréal, QC.
3 Division of Infectious Diseases, The Hospital for Sick Children, Department of Pediatrics, University of Toronto, Toronto, ON, Canada.