1. Department of Demyelinating Disease and Aging, National Institute of Neuroscience, NCNP, Kodaira, Tokyo, Japan
2. Department of Neurology, Faculty of Medicine, University of Tsukuba, Tsukuba, Ibaraki, Japan
3. Tokiwa Phytochemical Co., Ltd, Sakura, Chiba, Japan
4. Department of Mental Retardation and Birth Defect Research, National Institute of Neuroscience, NCNP, Kodaira, Tokyo, Japan
5. Department of Degenerative Neurological Diseases, National Institute of Neuroscience, NCNP, Kodaira, Tokyo, Japan
6. Laboratory of Pharmacology, Faculty of Pharmaceutical Sciences, Tokyo University of Science, Noda, Chiba, Japan
7. Department of Dementia and Higher Brain Function, Tokyo Metropolitan Institute of Medical Science, Setagaya, Tokyo, Japan
8. Department of Psychiatry and Behavioral Science, Graduate School of Medicine, Juntendo University, Tokyo, Japan
9. National Center Hospital, National Institute of Neuroscience, NCNP, Kodaira, Tokyo, Japan