1. Section of Pulmonary and Critical Care Medicine, Department of Medicine, University of Chicago, Chicago, Illinois
2. Pulmonary and Critical Care Medicine, Cedars-Sinai Medical Center, Los Angeles, California
3. Pulmonary and Critical Care Medicine, University of California at Davis, Sacramento, California
4. Division of Pulmonary and Critical Care Medicine, University of Michigan Health System, Ann Arbor, Michigan
5. Department of Physiology and Cell Biology, University of Nevada School of Medicine, Reno, Nevada
6. University of Arizona Health Sciences at the University of Arizona, Tucson, Arizona
7. Section of Pulmonary, Critical Care and Sleep Medicine, Yale University School of Medicine, New Haven, Connecticut; and
8. Weill Cornell Medical College, Cornell University, New York, New York