1. Departments of Pediatrics & Emergency Medicine Children's National HospitalThe George Washington University Washington DC USA
2. Department of Pediatrics University of Utah Salt Lake City UT USA
3. Department of Pediatrics Children's Hospital of PhiladelphiaUniversity of Pennsylvania Philadelphia PA USA
4. Department of Emergency Medicine University of California Davis CA USA
5. James M. Anderson Center for Health Systems Excellence Cincinnati Children's Hospital Medical Center Cincinnati OH USA
6. Department of Pediatrics University of ColoradoChildren's Hospital Colorado Aurora CO USA
7. Department of Pediatrics Ann & Robert H. Lurie Children's HospitalNorthwestern University Feinberg School of Medicine Chicago IL USA