1. Division of Emergency Medicine, Ann & Robert H. Lurie Children’s Hospital of Chicago, Chicago, Illinois
2. Division of Emergency Medicine, Boston Children’s Hospital, Boston, Massachusetts
3. Department of Surgery, Boston Children’s Hospital, Boston, Massachusetts
4. Department of Health Systems Science, Kaiser Permanente Bernard J. Tyson School of Medicine, Pasadena, California
5. Division of Emergency Medicine, Department of Pediatrics, Children’s National Hospital, George Washington University, Washington, DC