1 Department of Medicine, University of Toronto, Division of Respirology, Faculty of Medicine, University of Toronto, Toronto, ON, Canada. Electronic address: nermin.diab@mail.mcgill.ca.
2 Toronto Western Hospital, Toronto, ON, Canada.
3 Department of Medicine, University of Toronto, Division of Respirology, Faculty of Medicine, University of Toronto, Toronto, ON, Canada; Toronto Western Hospital, Toronto, ON, Canada.
4 Department of Medicine, University of Toronto, Division of Respirology, Faculty of Medicine, University of Toronto, Toronto, ON, Canada; St Michael's Hospital, Toronto, ON, Canada.