1. Division of Pulmonary, Critical Care, and Sleep Medicine
2. Division of Allergy and Infectious Diseases
3. Department of Medicine, and
4. Department of Radiology, University of Washington, Seattle, Washington
5. Division of Pulmonary, Allergy, and Critical Care Medicine, Vanderbilt University, Nashville, Tennessee; and
6. Division of Pulmonary and Critical Care Medicine, Oregon Health and Science University, Portland, Oregon