1. Department of Pediatrics; University of Texas Southwestern Medical School; Dallas TX
2. Department of Pediatrics; Columbia University College of Physicians and Surgeons; New York NY
3. Departments of Emergency Medicine and Pediatrics; NYU School of Medicine; New York NY
4. Department of Pediatrics; University of Pennsylvania; School of Medicine; Philadelphia PA
5. Departments of Pediatrics and Emergency Medicine; State University of New York at Buffalo School of Medicine and Biomedical Sciences; Buffalo NY
6. Department of Pediatrics; University of Utah and PECARN Data Coordinating Center; Salt Lake City UT
7. Department of Emergency Medicine; University of Michigan School of Medicine and Hurley Medical Center; Flint MI
8. Departments of Emergency Medicine and Pediatrics; Newark Beth Israel Medical Center; Newark NJ
9. Departments of Pediatrics and Emergency Medicine; George Washington University School of Medicine; Washington DC
10. Division of Emergency Medicine; Michigan State University School of Medicine/Helen Devos Children's Hospital; Grand Rapids MI
11. Department of Emergency Medicine; University of California; Davis School of Medicine; Sacramento CA
12. Department of Pediatrics; University of California; Davis School of Medicine; Sacramento CA