1. Division of Pulmonary and Critical Care Medicine, Oregon Health & Science University, Portland, Oregon
2. Division of Allergy, Pulmonary, and Critical Care Medicine, Vanderbilt University, Nashville, Tennessee
3. Division of Pulmonary Diseases, Critical Care, and Environmental Medicine, Tulane University, New Orleans, Louisiana
4. Division of Pulmonary, Allergy, and Critical Care Medicine, University of Alabama at Birmingham, Birmingham, Alabama
5. Division of Pulmonary, Allergy, Critical Care and Sleep Medicine, Emory University, Atlanta, Georgia
6. Division of Pulmonary and Critical Care Medicine, University of California, San Francisco, San Francisco, California; and
7. Division of Pulmonary, Critical Care, Sleep, and Occupational Medicine, Indiana University, Indianapolis, Indiana