1. The Department of Emergency Medicine Hurley Medical Center Flint MI
2. The Department of Emergency Medicine University of Michigan Ann Arbor MI
3. The University of Pennsylvania School of Medicine Philadelphia PA
4. The Department of Pediatric Surgery University of Michigan Ann Arbor MI
5. The Nationwide Children's Hospital Columbus OH
6. The University of Maryland Medical Center Shock Trauma Baltimore MD
7. The Department of Surgery University of California Davis School of Medicine Davis CA
8. The Division of Emergency Medicine Children's National Medical Center Washington DC
9. The George Washington University School of Medicine Washington DC
10. The Department of Pediatrics University of Utah and PECARN Central Data Management and Coordinating Center Salt Lake City UT
11. The Department of Emergency Medicine University of California Davis School of Medicine Davis CA
12. The University of New York at Buffalo School of Medicine Buffalo NY
13. The Department of Pediatrics University of California Davis School of Medicine Davis CA