1. Department of Neurology, University of Tsukuba Hospital, Japan
2. Department of Neurology, Faculty of Medicine, University of Tsukuba, Japan
3. Department of Medicine (Neurology and Rheumatology), Shinshu University School of Medicine, Japan
4. Department of Pathology, University of Tsukuba Hospital, Japan
5. Department of Diagnostic Pathology, Faculty of Medicine, University of Tsukuba, Japan