[Zhang, Xi] Hunan First Normal Univ, Business Sch, Changsha, Hunan, Peoples R China.
[Zhang, Xi] Chinese Acad Sci, Inst Policy & Management, Beijing, Peoples R China.
[Guo, Dongmei] Cent Univ Finance & Econ, Sch Econ, Beijing 100081, Peoples R China.
[Xiao, Yi] Cent China Normal Univ, Sch Informat Management, Wuhan, Hubei, Peoples R China.
[Wang, Mingxi] Univ Int Business & Econ, Sch Int Trade & Econ, Beijing, Peoples R China.