1. Department of Neurology, National Center Hospital, National Center of Neurology and Psychiatry, Tokyo, Japan
2. Department of Neurology, Aizawa Hospital, Nagano, Japan
3. Department of Laboratory Medicine, National Center Hospital, National Center of Neurology and Psychiatry, Tokyo, Japan
4. Department of Neuromuscular Research, National Institute of Neuroscience, National Center of Neurology and Psychiatry, Tokyo, Japan
5. Department of Medical Genome Center, National Center of Neurology and Psychiatry, Tokyo, Japan