1. Department of Medicine
2. Department of Anesthesia, University of California, San Francisco (UCSF), San Francisco, California
3. Division of Pulmonary, Critical Care, and Sleep Medicine, Department of Veterans Affairs Medical Center, and Department of Medicine, UCSF, San Francisco, California
4. Departments of Radiology and Biomedical Imaging
5. Division of Pulmonary, Critical Care, and Sleep Medicine, Department of Medicine
6. Division of Occupational and Environmental Medicine, Department of Medicine, University of California, San Francisco, San Francisco, California, USA