1. Division of Emergency Medicine, Children's Hospital Boston, Harvard Medical School, Boston, Massachusetts;
2. Department of Pediatrics, Primary Children's Medical Center, Salt Lake City, Utah;
3. University of Utah School of Medicine, Salt Lake, Utah;
4. Silver Spring Emergency Physicians, Holy Cross Hospital, Silver Spring, Maryland;
5. Department of Surgery, Harlem Hospital Medical Center and
6. Departments of Pediatrics and Emergency Medicine, Children's National Medical Center, George Washington University School of Medicine, Washington, DC;
7. Division of Emergency Medicine, Helen DeVos Children's Hospital, Michigan State University School of Medicine, Grand Rapids, Michigan; and
8. Department of Pediatrics, Morgan Stanley Children's Hospital of New York–Presbyterian, Columbia University College of Physicians and Surgeons, New York, New York;
9. Department of Emergency Medicine and
10. Departments of Emergency Medicine and Pediatrics, Davis Medical Center, University of California, Davis School of Medicine, Davis, California