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Southern Med Univ, Dept Hlth Management, Sch Hlth Management, Guangzhou 510515, Guangdong, Peoples R China
Johns Hopkins Univ, Dept Hlth Policy & Management, Bloomberg Sch Publ Hlth, Baltimore, MD 21205 USA Southern Med Univ, Dept Hlth Management, Sch Hlth Management, Guangzhou 510515, Guangdong, Peoples R China