Division of Neurology, Nemours Children's Hospital Delaware, Wilmington, Delaware (S.K., E.M., M.E.R.B.); Department of Biological Sciences, University of Delaware, Newark, Delaware (S.K., M.E.R.B.); Center for Pediatric Research, Nemours Biomedical Research, Nemours Children's Hospital Delaware, Wilmington, Delaware (M.E.R.B.); and Department of Pediatrics, Thomas Jefferson University, Philadelphia, Pennsylvania (M.E.R.B.) matthew.butchbach@nemours.org.