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Univ Sci & Technol China, Sch Management, Dept Stat & Finance, Hefei 230026, Peoples R China
Xinhua Univ Anhui, Sch Business, Dept Business Adm, Hefei 230088, Peoples R China Univ Sci & Technol China, Sch Management, Dept Stat & Finance, Hefei 230026, Peoples R China