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Sichuan Univ, West China Sch Publ Hlth, Dept Epidemiol & Stat, 17,3 Sect South Renmin Rd, Chengdu 610041, Sichuan, Peoples R China
West China Fourth Hosp, 17,3 Sect South Renmin Rd, Chengdu 610041, Sichuan, Peoples R China Sichuan Univ, West China Sch Publ Hlth, Dept Epidemiol & Stat, 17,3 Sect South Renmin Rd, Chengdu 610041, Sichuan, Peoples R China