1 Department of Mental Retardation and Birth Defects Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry, Tokyo, Japan.
2 Department of Neurology, Children's National Medical Center, Washington, DC, USA.
3 Nemours Biomedical Research, Alfred I. duPont Hospital for Children, Wilmington, DE, USA.
4 Department of Neurology, Boston Children's Hospital, Harvard Medical School, Boston, MA, USA.
5 Department of Pediatrics, Children's National Medical Center, Washington, DC, USA.
6 Department of Physical Medicine and Rehabilitation, Children's National Medical Center, Washington, DC, USA.
7 Center for Genetic Medicine Research, Children's National Medical Center, Washington, DC, USA.
8 Nemours Biomedical Research, Alfred I. duPont Hospital for Children, Wilmington, DE, USA; Center for Genetic Medicine Research, Children's National Medical Center, Washington, DC, USA; Department of Biological Sciences, University of Delaware, Newark, DE, USA.
9 Department of Neurology, Children's National Medical Center, Washington, DC, USA; Department of Pediatrics, Children's National Medical Center, Washington, DC, USA; Jefferson Medical College, Thomas Jefferson University, Philadelphia, PA, USA. Electronic address: avanderv@childrensnational.org.