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China Med Univ, Sch Publ Hlth, Dept Epidemiol, Shenyang, Liaoning, Peoples R China
China Med Univ, Sch Publ Hlth, Dept Child & Adolescent Hlth, Shenyang, Liaoning, Peoples R China China Med Univ, Sch Publ Hlth, Dept Epidemiol, Shenyang, Liaoning, Peoples R China