1. Section of Pulmonary and Critical Care, Department of Medicine
2. Division of Pulmonary, Critical Care, and Sleep Medicine, Department of Medicine, University of California at Davis, Davis, California
3. Division of Pulmonary and Critical Care, Department of Medicine, NorthShore University HealthSystem, Evanston, Illinois; and
4. Department of Radiology, and
5. Department of Public Health Sciences, The University of Chicago, Chicago, Illinois
6. Pulmonary and Critical Care Medicine, University of Virginia, Charlottesville, Virginia