1. Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry, Kodaira, Tokyo 187-8502, Japan
2. Department of Pediatrics, Ewha Womans University School of Medicine, Yangcheon-gu, Seoul 158-710, Korea
3. Medical Genetics Branch, National Human Genome Research Institute,
4. NIH Undiagnosed Diseases Program, Common Fund, Office of the Director, National Institutes of Health, Bethesda, MD 20892, USA
5. Department of Genome Medicine Development, Medical Genome Center, National Center of Neurology and Psychiatry, Kodaira, Tokyo 187-8502, Japan