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Sichuan Univ, West China Sch Publ Hlth, Dept Epidemiol & Hlth Stat, Chengdu 610044, Peoples R China
Sichuan Univ, West China Hosp 4, Chengdu 610044, Peoples R China
Sichuan Univ, West China Hosp, Natl Clin Res Ctr Geriatr, Chengdu 610044, Peoples R China Sichuan Univ, West China Sch Publ Hlth, Dept Epidemiol & Hlth Stat, Chengdu 610044, Peoples R China