Affiliation: | 2. Division of Thoracic Surgery, Toronto General Hospital-University Health Network/University of Toronto, Toronto, Ont., Canada M5G 2C4;3. Division of Respirology, Toronto General Hospital-University Health Network/University of Toronto, Toronto, Ont., Canada M5G 2C4;4. Division of Radiology, David Geffen School of Medicine at UCLA, Los Angeles, CA |