Funding for this research was provided by:
Natural Science Foundation of China (31270040, 31471820)
Fundamental Research Funds for the Central Universities (106112017CDJQJ298831)
Natural Science Foundation of Chongqing (cstc2018jcyjAX0554)
Article History
Received: 27 January 2019
Revised: 4 March 2019
Accepted: 16 March 2019
First Online: 25 March 2019