[1] Natl Ctr Neurol & Psychiat, Musashi Hosp, Div Old Age Psychiat, Kodaira, Tokyo 1870031, Japan
[2] HEC Sci Clin, Inst Diabet & Obes Treatment, Yokohama, Kanagawa, Japan
[3] Yamanashi Kosei Hosp, Nursing Div, Yamanashi, Japan
[4] Teikyo Univ, Sch Med, Dept Psychiat, Tokyo 173, Japan
[5] Cornell Univ, Med Ctr, New York Hosp, Dept Psychiat, New York, NY 10021 USA