Affiliation: | 1. Department of Medicine, University of Toronto, Toronto, ON, Canada;2. Division of Respirology, Department of Medicine, St Michael''s Hospital, Toronto, ON, Canada;3. Corporate Health and Safety Services, St Michael''s Hospital, Toronto, ON, Canada;4. Infection Prevention and Control, St. Michael''s Hospital, Toronto, ON, Canada;5. Division of Infectious Diseases, Department of Medicine, St Michael''s Hospital, Toronto, ON, Canada |