1. Department of Emergency Medicine, Harbor–UCLA (University of California, Los Angeles) Medical Center, Torrance2Los Angeles Biomedical Research Institute, Harbor–UCLA Medical Center, Torrance3Department of Medicine, David Geffen School of Medicine, UCLA4De
2. National Emergency Medical Services for Children Data Analysis Resource Center, Salt Lake City, Utah6Department of Pediatrics, University of Utah, Salt Lake City
3. Austin-Travis County Emergency Medical Services, Austin, Texas8Department of Pediatric Emergency Medicine, Dell Children’s Medical Center, Austin, Texas
4. Emergency Medical Services for Children and Injury Prevention, Maternal and Child Health Bureau, Health Resources and Services Administration, Rockville, Maryland