1. Department of Emergency Medicine; Hurley Medical Center; Flint MI
2. Department of Emergency Medicine; University of Michigan; Ann Arbor MI
3. Department of Pediatrics; Division of Pediatric Emergency Medicine; Wayne State University School of Medicine; Detroit MI
4. Division of Emergency Medicine; Helen DeVos Children's Hospital, and the Department of Emergency Medicine; Michigan State University; East Lansing MI
5. Departments of Emergency Medicine and Pediatrics; Western Michigan University School of Medicine; Kalamazoo MI
6. Department of Pediatrics; Division of Pediatric Emergency Medicine; Northwestern University's Feinberg School of Medicine; Chicago IL
7. Department of Pediatrics; Division of Pediatric Emergency Medicine; University of Pennsylvania School of Medicine; Philadelphia PA
8. Departments of Pediatrics and Emergency Medicine; NYU School of Medicine; New York NY
9. Silver Spring Emergency Physicians; Holy Cross Hospital; Silver Spring MD
10. Department of Pediatrics; University of Utah and PECARN Data Coordinating Center; Salt Lake City UT
11. Division of Pediatric Emergency Medicine; Morgan Stanley Children's Hospital; Columbia University College of Physicians and Surgeons; New York NY
12. Department of Emergency Medicine; University of California at Davis School of Medicine; Sacramento CA
13. Department of Pediatrics; University of California at Davis School of Medicine; Sacramento CA