Funding for this research was provided by:
Postdoctoral Science Foundation of China (2015M571394)
National Natural Science Foundation of China (51509056)
Heilongjiang Postdoctoral Fund (LBH-Z14059)
Ministry of Science and Technology, Taiwan (MOST 104-2410-H-161-002)
Science and technology project of Western Transportation Construction of Ministry of Communications (2014364554050)