[1] Tokyo Metropolitan Inst Geriatr & Gerontol, Tokyo, Japan
[2] Univ Tsukuba, Tsukuba, Japan
[3] Niigata Univ, Niigata, Japan
[4] Osaka Univ, Grad Sch Med, Osaka, Japan
[5] Sunagawa City Med Ctr, Sunagawa, Japan
[6] Akita Univ, Akita, Japan
[7] Kurume Univ, Sch Med, Kurume, Japan
[8] Fukushima Med Univ, Aizu Med Ctr, Fukushima, Japan
[9] Japanese Psychogeriatr Soc, Tokyo, Japan
[10] Tohoku Univ, Grad Sch Med, Sendai, Japan
[11] Ehime Univ, Matsuyama, Japan
[12] Yukiguni Yamato Hosp, Minamiuonuma, Japan