title: In reply.
authors.affiliation: McGill International TB Center, Montreal, Respiratory Epidemiology and Clinical Research Unit, Research Institute of the McGill University Health Centre, Montreal, Quebec, Canada <email></email>, Email: faiz.ahmadkhan@mcgill.ca.
authors.forename: Faiz Ahmad
authors.initials: FA
authors.lastname: Khan
authors.affiliation: McGill International TB Center, Montreal.
authors.forename: Madhukar
authors.initials: M
authors.lastname: Pai