1 Division of Neurology, Saitama Children's Medical Center, Saitama, Japan; Department of Pediatrics, The Jikei University School of Medicine, Tokyo, Japan. Electronic address: ryuki@jikei.ac.jp.
2 Division of Neurology, Saitama Children's Medical Center, Saitama, Japan.
3 Core Research Facilities for Basic Science (Molecular Cell Biology), The Jikei University School of Medicine, Tokyo, Japan.
4 Division of Medical Genetics, Saitama Children's Medical Center, Saitama, Japan.