[Tang, Yi;Wang, Zhong-wei] Cent South Univ Forestry & Technol, Coll Transportat & Logist, Changsha 410004, Hunan, Peoples R China.^[Tang, Yi;Du, Li-ling] Xiangtan Univ, Sch Publ Adm, Xiangtan 411105, Hunan, Peoples R China.^[Tan, Jing-jia] Hunan Vocat Inst Technol, Xiangtan 411105, Hunan, Peoples R China.