1. Division of Thoracic Radiology, University of Chicago, Chicago, Illinois
2. Division of Pulmonary and Critical Care Medicine, Nanjing Drum Tower Hospital, Nanjing, Jiangsu, China
3. Division of Pulmonary and Critical Care Medicine, Beijing Chaoyang Hospital, Beijing, China
4. Division of Thoracic Radiology, National Jewish Health, Denver, Colorado
5. Division of Pulmonary and Critical Care Medicine, University of Virginia, Charlottesville, Virginia
6. Division of Pulmonary and Critical Care Medicine, National Jewish Health, Denver, Colorado; and
7. Pontificia Universidad Católica Madre y Maestra, Santiago, Dominican Republic