1. From the Department of Anesthesiology, University of Washington School of Medicine, Seattle, Washington, and the Department of Anesthesia and Critical Care, Children's Hospital and Medical Center, Seattle, Washington;
2. Division of Emergency Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, and the University of Cincinnati School of Medicine, Cincinnati, Ohio; and the
3. Department of Pediatrics, Division of Emergency Medicine, Children's Mercy Hospital, Kansas City, Missouri, and University of Missouri–Kansas City School of Medicine, Kansas City, Missouri.