Affiliation: | 1. Department of Medicine, University of California, San Francisco, San Francisco, CA;2. Department of Epidemiology and Biostatistics, University of California, San Francisco, San Francisco, CA;3. Department of Radiology, University of California, San Francisco, San Francisco, CA;4. Department of Pathology, University of California, San Francisco, San Francisco, CA;5. Department of Medicine, Centre Hospitalier de l''Université de Montréal, Montreal, QC, Canada;6. Department of Medicine, University of Calgary, Calgary, AB, Canada;7. Department of Respiratory Diseases, Pontifical Catholic University of Chile, Santiago, Chile;8. Department of Medicine and Centre for Heart Lung Innovation, University of British Columbia, Vancouver, BC, Canada |