Affiliation: | 1. Pulmonary & Critical Care Medicine, University of California San Diego, San Diego, CA, USA;2. Advanced Lung Disease and Lung Transplant Program, Department of Medicine, Inova Fairfax Hospital, Falls Church, VA, USA;3. Fairfax Radiological Consultants, Falls Church, VA, USA;4. Department of Medicine, Division of Critical Care and Hospital Medicine, National Jewish Health, Denver, CO, USA |