1. University of Arizona College of Medicine, Department of Emergency Medicine, Tucson, Arizona
2. Virginia Commonwealth University School of Medicine, Richmond, Virginia
3. University of Sydney, Faculty of Medicine and Health, Sydney, Australia
4. University of Arizona College of Medicine, Department of Emergency Medicine, Tucson, Arizona; University of Arizona College of Medicine, Department of Medicine, Division of Pulmonary, Allergy, Critical Care, and Sleep Medicine, Tucson, Arizona