1. Division of Pulmonary and Critical Care Medicine, Mayo Clinic, Rochester, Minnesota;
2. Division of Pulmonary Sciences and Critical Care Medicine, University of Colorado, Denver, Colorado;
3. Division of Pulmonary, Critical Care, Sleep, and Occupational Medicine, Indiana University School of Medicine, Indianapolis, Indiana;
4. Section of Pulmonary, Critical Care, and Sleep Medicine, Veterans Affairs Puget Sound Healthcare System, Seattle, Washington;
5. Division of Pulmonary, Critical Care, and Sleep Medicine, University of Washington School of Medicine, Seattle, Washington;
6. Department of Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania;
7. Division of Pulmonary, Critical Care, and Sleep Medicine, University of Kansas Medical Center, Kansas City, Kansas;
8. Division of Pulmonary, Allergy, Critical Care, and Sleep Medicine, Emory University School of Medicine, Atlanta, Georgia;
9. Division of Pulmonary, Allergy, and Critical Care Medicine, Oregon Health & Science University, Portland, Oregon;
10. Section of Pulmonary Diseases, Critical Care, and Environmental Medicine, Department of Medicine, Tulane University School of Medicine, New Orleans, Louisiana;
11. Division of Pulmonary and Critical Care Medicine, Department of Medicine, University of Maryland School of Medicine, Baltimore, Maryland; and
12. Division of Pulmonary, Critical Care, and Sleep Medicine, Westchester Medical Center, Valhalla, New York