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China Med Univ, Dept Clin Epidemiol, Affiliated Hosp 1, Shenyang 110001, Peoples R China
China Med Univ, Ctr Evidence Based Med, Affiliated Hosp 1, Shenyang 110001, Peoples R China China Med Univ, Dept Clin Epidemiol, Affiliated Hosp 1, Shenyang 110001, Peoples R China