1. The Warren Alpert Medical School of Brown University, Departments of Psychiatry and Human Behavior, Pediatrics, Emergency Medicine, Providence, Rhode Island, USA;
2. Rhode Island Hospital, Department of Emergency Medicine, Providence, Rhode Island, USA;
3. University of Utah, Department of Pediatrics, Salt Lake City, Utah, USA;
4. Nemours/Alfred I. duPont Hospital for Children, Department of Pediatrics, Wilmington, Delaware, USA;
5. Baylor College of Medicine/Texas Children’s Hospital, Departments of Emergency Medicine and Pediatrics, Houston, Texas, USA;
6. University of California, Davis, Department of Pediatrics, Davis, California, USA;
7. St. Louis Children’s Hospital/Washington University, Department of Emergency Medicine, St. Louis, Washington, USA;
8. Children’s Hospital – Colorado, Departments of Pediatric Emergency Medicine and Pediatrics, Aurora, Colorado, USA;
9. Children’s National Medical Center, Department of Emergency Medicine and Trauma Services, Washington, DC, USA;
10. Columbia University Medical Center, Department of Pediatric Emergency Medicine, New York, New York, USA;
11. Nationwide Children’s Hospital, Departments of Pediatrics and Emergency Medicine, Columbus, Ohio, USA;
12. The Children’s Hospital of Philadelphia, Departments of Pediatrics and Emergency Medicine, Philadelphia, Pennsylvania, USA;
13. Los Angeles Biomedical Research Institute at Harbor-UCLA Medical Center, Department of Emergency and Pediatric Emergency Medicine, Los Angeles, California, USA;
14. Medical College of Wisconsin, Department of Pediatric Emergency Medicine, Milwaukee, Wisconsin, USA;
15. University of Pittsburgh/Children’s Hospital of Pittsburgh of UPMC, Division of Pediatric Emergency Medicine, Pittsburgh, Pennsylvania, USA;
16. Boston Children’s Hospital, Department of Pediatrics, Boston, Massachusetts, USA;
17. University of California, San Francisco, Department of Pediatric Emergency Medicine, San Francisco, California, USA;
18. Lurie Children’s Hospital of Chicago, Department of Pediatric Emergency Medicine, Chicago, Illinois, USA;
19. University of Michigan, Department of Emergency Medicine, Ann Arbor, Michigan, USA