1. From the Division of Emergency Medicine (J.M.C.), Children's National Hospital; Departments of Pediatrics and Emergency Medicine (J.M.C.), George Washington University, Washington, DC; Department of Neurology (J.K.), University of Virginia, Charlottesville; Department of Emergency Medicine (R.S.S.), University of Michigan, Ann Arbor; Medical University of South Carolina (J.J.E.), Charleston; Harvard Medical School (E.S.R.); Massachusetts General Hospital (E.S.R.), Boston; Ken and Ruth Davee...