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Sichuan Univ, West China Hosp, Dept Geriatr, Chengdu, Sichuan, Peoples R China
Sichuan Univ, Natl Clin Res Ctr Geriatr, Chengdu, Sichuan, Peoples R China
St Louis Univ, Sch Med, Dept Internal Med, St Louis, MO USA
St Louis Univ, Sch Med, Div Geriatr, St Louis, MO USA Sichuan Univ, West China Hosp, Dept Geriatr, Chengdu, Sichuan, Peoples R China