[Li Jia] NanHua Univ, Logist Management Dept, Hengyang 421002, Hunan, Peoples R China.^[Li Jia;Chen Guosheng] Tourism planning & design inst Hunan Inst, HengYang 421008, Peoples R China.^[Chen Guosheng;Luo Xin] Business Coll Central South Univ, Changsha, Hunan, Peoples R China.