1. Division of Pulmonary and Critical Care Medicine, University of Washington, Seattle, Washington.
2. School of Public Health, Drexel University, Philadelphia, Pennsylvania.
3. OhioHealth, Columbus, Ohio.
4. Department of Emergency Medicine, University of Colorado School of Medicine, Aurora, Colorado.
5. Division of Pulmonary, Allergy, and Critical Care Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania.
6. Department of Emergency Medicine, Medstar Washington Hospital Center, Washington, District of Columbia.
7. Department of Emergency Medicine, Thomas Jefferson University, Philadelphia, Pennsylvania.
8. Department of Emergency Medicine, Center for Resuscitation Science, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania.