[1] Tokyo Med & Dent Univ, Grad Sch Med, Dept Neurol & Neurol Sci, Bunkyo Ku, Tokyo 1138519, Japan
[2] Kanazawa Univ, Sch Med, Dept Neurol, Kanazawa, Ishikawa, Japan
[3] Yokufukai Geriatr Hosp, Dept Internal Med, Tokyo, Japan
[4] Tokyo Inst Psychiat, Dept Neuropathol, Tokyo, Japan
[5] Hatsuishi Hosp, Dept Internal Med, Chiba, Japan