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Tokyo Metropolitan Geriatr Med Ctr, Itabashi Ku, 35-2 Sakae Cho, Tokyo 1730015, Japan
Hokkaido Univ, Fac Med Dent, Dept Oral Hlth Sci, Gerontol,Kita Ku, Kita 13 Jo Nishi 7 Chome, Sapporo, Hokkaido 0608586, Japan Tokyo Metropolitan Geriatr Med Ctr, Itabashi Ku, 35-2 Sakae Cho, Tokyo 1730015, Japan