1. Division of Pulmonary, Allergy and Critical Care Medicine
2. UAB Lung Imaging Core
3. UAB Lung Health Center, and
4. Department of Biomedical Engineering, University of Iowa, Iowa City, Iowa; and
5. Department of Radiology, University of Iowa Carver College of Medicine, Iowa City, Iowa
6. Department of Radiology, University of Alabama at Birmingham, Birmingham, Alabama