1. Department of Neurology, Graduate School of Medicine, Chiba University, Chiba, Japan,
2. Department of Neurology, Dongzhimen Affiliated Hospital, Beijing University of Chinese Medicine, Beijing, China,
3. Department of Neurology, The Second Hospital of Hebei Medical University, Shijiazhuang, Hebei, China,
4. Department of Neurology, National Hospital Organization Chibahigashi National Hospital, Chiba, Japan,
5. Department of Neurological Surgery, Graduate School of Medicine, Chiba University, Chiba, Japan, and
6. Department of Biochemistry and Genetics, Graduate School of Medicine, Chiba University, Chiba, Japan