1. Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, University of Michigan, Ann Arbor, Michigan;
2. Division of Pulmonary, Critical Care and Sleep Medicine, University of California, Davis, Davis, California;
3. Section of Pulmonary and Critical Care Medicine, University of Chicago, Chicago, Illinois;
4. National Heart and Lung Institute, Imperial College London, London, United Kingdom;
5. Royal Brompton and Harefield Hospitals, Guy’s and St. Thomas’ NHS Foundation Trust, London, United Kingdom;
6. Division of Pulmonary and Critical Care Medicine, University of Texas Southwestern Medical Center, Dallas, Texas; and
7. Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Columbia University, New York, New York