1. Section of Interventional Pulmonology, Division of Pulmonary and Critical Care Medicine, The Johns Hopkins University School of Medicine, Baltimore, Maryland;
2. Division of Pulmonary and Critical Care Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina;
3. University of Alabama at Birmingham, Birmingham, Alabama;
4. Lahey Hospital and Medical Center, Burlington, Massachusetts;
5. Division of Pulmonary, Critical Care, and Sleep Medicine, Mayo Clinic, Rochester, Minnesota; and
6. The University of Chicago, Chicago, Illinois