1. Department of Pediatrics Section of Neurology (SR, EM, HWG, SG, J. Marks, JJ, R. Messer, J. Martin, MEY), Department of Pediatrics (MS, LS), and Department of Pediatrics Section of Emergency Medicine (R. Mistry), University of Colorado Anschutz School of Medicine; and Department of Pediatrics and Neurology (CAP), University of Pennsylvania Perelman School of Medicine.