1. From the Division of Emergency Medicine, Children's Hospital, Harvard Medical School, Boston, Massachusetts;
2. Pediatric Neuroradiology, Lucile Salter Packard Children's Hospital, Stanford University Medical School, Palo Alto, California; the
3. Division of Neurosurgery, Children's Hospital of Philadelphia, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania; the
4. Division of General Pediatrics, Children's Hospital, Harvard Medical School, Boston, Massachusetts; the
5. Division of Emergency Medicine, St Louis Children's Hospital, Washington University School of Medicine, St Louis, Missouri; the
6. Department of Emergency Medicine, Harbor–UCLA Medical Center, UCLA School of Medicine, Torrance, California; the
7. Division of Neurosurgery, Riley Hospital for Children, Indiana University School of Medicine, Indianapolis, Indiana; and the
8. Division of Emergency Medicine, Primary Children's Medical Center, University of Utah School of Medicine, Salt Lake City, Utah.