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Guangzhou Ctr Dis Control & Prevent, Dept Vital Stat, Guangzhou 510440, Guangdong, Peoples R China
Southern Med Univ, Sch Publ Hlth & Trop Med, Guangzhou, Guangdong, Peoples R China Guangzhou Ctr Dis Control & Prevent, Dept Vital Stat, Guangzhou 510440, Guangdong, Peoples R China