1. Division of Emergency Medicine, Ann & Robert H. Lurie Children's Hospital of Chicago, Northwestern University Feinberg School of Medicine, Chicago, Illinois
2. Department of Pediatrics, Section of Emergency Medicine, University of Chicago School of Medicine, Chicago, Illinois
3. Division of Emergency Medicine, UPMC Children’s Hospital of Pittsburgh, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania
4. Department of Emergency Medicine, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania
5. Division of Pediatric Emergency Medicine, Dept of Emergency Medicine, University of Florida College of Medicine, Jacksonville, Florida