1. Division of Pulmonary and Critical Care Medicine, Department of Medicine
2. Department of Radiology, National Jewish Health, Denver, Colorado
3. Centre for Inflammation Research, Clinical Research Imaging Centre, University of Edinburgh, Edinburgh, United Kingdom
4. Department of Radiology, and
5. Department of Radiology, University of Iowa, Iowa City, Iowa
6. Department of Biostatistics, University of Michigan, Ann Arbor, Michigan
7. Department of Biostatistics and Bioinformatics, Duke University, Durham, North Carolina
8. Duke Clinical Research Institute, Duke Medical Center, Durham, North Carolina; and
9. Division of Pulmonary and Critical Care Medicine, Department of Medicine, Cornell Medical College, New York, New York