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Sichuan Univ, West China Hosp, Ctr Geriatr & Gerontol, 37 Guo Xue Xiang, Chengdu 610041, Sichuan, Peoples R China Sichuan Univ, West China Hosp, Ctr Geriatr & Gerontol, 37 Guo Xue Xiang, Chengdu 610041, Sichuan, Peoples R China