1. UAB Lung Imaging Lab,
2. Lung Health Center,
3. Division of Pulmonary, Allergy, and Critical Care Medicine,
4. Department of Electrical and Computer Engineering, and
5. Department of Biostatistics and Bioinformatics, National Jewish Health, Denver, Colorado; and
6. Division of Pulmonary, Critical Care, Allergy, and Sleep Medicine, University of California San Francisco, San Francisco, California
7. Department of Preventive Medicine, University of Alabama at Birmingham, Birmingham, Alabama;