1. Department of Pediatrics, Duke University School of Medicine, Department of Emergency Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
2. Department of Surgery, Duke University School of Medicine, Department of Emergency Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
3. Children’s Primary Care Research Group, Department of Pediatrics, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
4. Office of Emergency Medical Services, North Carolina Department of Health and Human Services, Raleigh, North Carolina