1. Lewis Katz School of Medicine at Temple University, Philadelphia, Pennsylvania
2. Pneumology and Critical Care Medicine, Thoraxklinik, University of Heidelberg, Heidelberg, Germany
3. Division of Pulmonary Medicine, Mayo Clinic, Jacksonville, Florida
4. Department of Medicine and Department of Thoracic Surgery, Vanderbilt University, Nashville, Tennessee
5. Respiratory Medicine at the Royal Brompton Hospital and National Heart & Lung Institute, Imperial College, London, United Kingdom
6. Department of Pulmonary Diseases, University Medical Center Groningen, University of Groningen, Groningen, the Netherlands
7. Department of Respiratory and Critical Care Medicine, Krankenhaus Nord, Vienna, Austria; and
8. Division of Pulmonary, Allergy, and Critical Care Medicine, Department of Medicine, Duke University School of Medicine, Durham, North Carolina