Affiliation: | Department of Cytogenetics, Medical Research Institute, Tokyo Medical and Dental University, 5–45 Yushimu I-chome, Bunkyo-ku, Tokyo, 113 Japan;Department of Neurology, Shimoshizu National Hospital and Sanatorium, Chiba;Department of Pediatrics, Shimoshizu National Hospital and Sanatorium, Chiba;Department of Neurology, Institute of Brain Research, Faculty of Medicine, University of Tokyo, Japan |