[1] Univ Tsukuba, Tokyo, Japan
[2] Seoul Natl Univ, Coll Med, Dept Rehabil Med, Bundang Hosp, Seoul, South Korea
[3] Mahidol Univ, Siriraj Hosp, Fac Med, Div Geriatr Med,Dept Prevent & Social Med, Bangkok, Thailand
[4] Univ Tokyo, Inst Gerontol, Tokyo, Japan
[5] Kyung Hee Univ, East West Med Res Inst, Dept Biomed Sci & Technol, Coll Med, Seoul, South Korea
[6] Tan Tock Seng Hosp, Inst Geriatr & Act Aging, Singapore, Singapore
[7] Natl Ctr Geriatr & Gerontol, 7-430 Morioka Cho, Obu, Aichi 4740038, Japan