1. Division of Emergency Medicine, Ann and Robert H. Lurie Children’s Hospital of Chicago, Northwestern University Feinberg School of Medicine, Chicago, Illinois;
2. Division of Pediatric Emergency Medicine, Children’s National Medical Center, George Washington School of Medicine, Washington, District of Columbia;
3. Departments of Radiology,
4. Surgery,
5. Departments of Pediatrics and
6. Emergency Medicine, Children’s Hospital of Michigan, Detroit, Michigan;
7. Department of Pediatrics, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio;
8. Department of Pediatrics, Nemours Children’s Hospital, Orlando, Florida;
9. Department of Pediatrics, University of Utah, Salt Lake City, Utah;
10. Department of Emergency Medicine and Pediatrics, University of Michigan, Ann Arbor, Michigan;
11. Holy Cross Hospital, Silver Spring, Maryland; and
12. Columbia University College of Physicians and Surgeons, New York, New York
13. Emergency Medicine, and
14. Pediatrics, University of California, Davis School of Medicine, Davis, California;