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China Med Univ, Sch Hlth Management, Dept Social Med, 77 Puhe Rd,Shenyang North New Area, Shenyang 110122, Liaoning, Peoples R China China Med Univ, Sch Hlth Management, Dept Social Med, 77 Puhe Rd,Shenyang North New Area, Shenyang 110122, Liaoning, Peoples R China