[1] Nagoya Univ, Grad Sch Med, Dept Psychiat, Nagoya, Aichi 830, Japan
[2] Nagoya Univ, Grad Sch Med, Dept Med Technol, Nagoya, Aichi 980, Japan
[3] Fujita Hlth Univ, Sch Med, Dept Psychiat, Aichi, Japan
[4] Okayama Univ, Dept Neuropsychiat, Grad Sch Med & Dent, Okayama, Japan
[5] Kurume Univ, Sch Med, Dept Neuropsychiat, Kurume, Fukuoka, Japan
[6] Tohoku Univ, Grad Sch Med, Dept Neurosci, Div Psychobiol, Sendai, Miyagi 43131, Japan
[7] Chiba Univ, Grad Sch Med, Dept Psychiat, Chiba, Japan
[8] Natl Ctr Hosp Mental Nervous & Muscular Disorders, Div Psychiat, Natl Ctr Neurol & Psychiat, Tokyo, Japan
[9] Natl Ctr Neurol & Psychiat, NIMH, Div Psychogeriatr, Chiba, Japan
[10] Hamamatsu Univ Sch Med, Dept Psychiat & Neurol, Hamamatsu, Shizuoka, Japan