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Sun Yat Sen Univ, Sch Publ Hlth, Dept Med Stat & Epidemiol, 74 Zhongshan Rd 2, Guangzhou 510080, Guangdong, Peoples R China
Sun Yat Sen Univ, Affiliated Hosp 1, Clin Trials Ctr, Epidemiol Res Unit, Guangzhou 510080, Guangdong, Peoples R China Sun Yat Sen Univ, Sch Publ Hlth, Dept Med Stat & Epidemiol, 74 Zhongshan Rd 2, Guangzhou 510080, Guangdong, Peoples R China