1. Temerty Faculty of Medicine, University of Toronto, Toronto, ON M5S 1A8, Canada
2. Department of Medical Imaging, Faculty of Medicine, University of Toronto, Toronto, ON M5S 1A1, Canada
3. Department of Medical Imaging, Toronto General Hospital, Toronto, ON M5G 2C4, Canada
4. Division of Respirology, University Health Network, Toronto, ON M5T 2S8, Canada