1 Section of Pediatric Emergency Medicine, University of Colorado School of Medicine, Aurora2Departments of Emergency Medicine and Pediatrics, Children's Hospital Colorado, Aurora.
2 Section of Emergency Medicine, Columbia University College of Physicians and Surgeons, New York, New York4Morgan Stanley Children's Hospital of New York-Presbyterian, New York.
3 Department of Emergency Medicine, University of California, Davis, School of Medicine, Sacramento6University of California, Davis, Medical Center, Sacramento.