[1] Wuhan Univ, Econ & Management Sch, Wuhan 430072, Peoples R China
[2] Shanxi Univ Finance & Econ, Sch Stat, Taiyuan 030006, Peoples R China
[3] Univ Waikato, Sch Accounting Finance & Econ, Hamilton, New Zealand
[4] East China Univ Sci & Technol, Sch Business, Shanghai 200237, Peoples R China
[5] Shanxi Univ Finance & Econ, Sch Finance & Publ Econ, Taiyuan 030006, Peoples R China