Funding for this research was provided by:
National Natural Science Foundation of China (61671389)
China Postdoctoral Science Foundation Funded Project (2017M620779)
Chongqing Postdoctoral Science Foundation Special Funded Project (Xm2017107)
the Fundamental Research Funds for the Central Universities (XDJK2016C096)
Article History
Received: 6 February 2018
Revised: 11 December 2018
Accepted: 13 December 2018
First Online: 18 December 2018