[1] Henan Agr Univ, Coll Econ & Management, Zhengzhou 450002, Peoples R China
[2] Cag Univ, Fac Econ & Adm Sci, TR-33800 Mersin, Turkey
[3] China Med Univ, China Med Univ Hosp, Dept Med Res, Taichung 406040, Taiwan
[4] Univ Pitesti, Dept Finance Accounting & Econ, Pitesti 110040, Romania