1. Division of Neurology, Department of Internal Medicine, Saga University Faculty of Medicine, Saga, Japan.
2. Department of Neuropathology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan.
3. Department of Neurology, Neuro Muscular Center, National Hospital Organization Omuta National Hospital, Omuta, Japan.
4. Department of Pathology, Saga University Hospital, Saga, Japan.
5. Department of Neurological Science, Tohoku University Graduate School of Medicine, Sendai, Japan.