1. Division of Child Neurology Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio
2. University of Cincinnati Academic Health Center, Department of Neurology and the Neuroscience Institute, Cincinnati, Ohio
3. Center for Epidemiology and Biostatistics, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio
4. University of Cincinnati Academic Health Center, Department of Neurology and the Neuroscience Institute, Cincinnati, Ohio, kleinddo@ucmail.uc.edu