[1] Tokyo Metropolitan Geriatr Ctr, Itabashi Ku, Tokyo 1730015, Japan
[2] Tokyo Metropolitan Tama Geriatr Hosp, Tokyo, Japan
[3] Kawasaki Med Sch, Kurashiki, Okayama, Japan
[4] Radiat Effects Res Fdn, Hiroshima, Japan
[5] Res Inst & Practice Involut Dis, Nagano, Japan
[6] Hamamatsu Univ Sch Med, Hamamatsu, Shizuoka 43131, Japan
[7] Kinki Univ, Sch Med, Osaka 589, Japan
[8] Kyushu Univ, Med Inst Bioregulat, Fukuoka 812, Japan
[9] Univ Tokyo, Fac Med, Tokyo 113, Japan
[10] Yokohama City Univ, Sch Med, Yokohama, Kanagawa 232, Japan
[11] Okayama Univ, Sch Med, Okayama 700, Japan
[12] Tokyo Metropolitan Rehabil Hosp, Dept Rehabil, Tokyo, Japan
[13] Tottori Med Sch, Dept Orthoped Surg, Yonago, Tottori, Japan