[1] Kanazawa Univ, Grad Sch Med Sci, Dept Neurol & Neurobiol Aging, Kanazawa, Ishikawa 920, Japan
[2] Tokyo Inst Psychiat, Dept Neuropathol, Tokyo, Japan
[3] Yokufukai Geriatr Hosp, Dept Pathol, Tokyo, Japan
[4] Yokufukai Geriatr Hosp, Dept Internal Med, Tokyo, Japan
[5] Tokyo Med & Dent Univ, Grad Sch Med & Dent Sci, Dept Neurol, Tokyo, Japan