[Zhou, Tao] Jinan Univ, Sch Publ Adm & Emergency Management, Guangzhou 510632, Guangdong, Peoples R China.
[Liu, Xia] Guangdong Univ Foreign Studies, Coll Continuing Educ, Guangzhou 510420, Guangdong, Peoples R China.
[Liu, Xia] Guangdong Univ Foreign Studies, Open Coll, Guangzhou 510420, Guangdong, Peoples R China.
[Liu, Xia] Hunan Agr Univ, Sci Coll, Changsha 410128, Hunan, Peoples R China.
[Shi, Haiping] Guangdong Construct Polytech, Modern Business & Management Dept, Guangzhou 510440, Guangdong, Peoples R China.