Funding for this research was provided by:
National Natural Science Foundation of China (71571024, 71872021)
Training Project of the Chongqing Social Science Planning (2018PY78)
Chongqing Graduate Student Research Innovation Project (CYS18317)
Fundamental Research Funds for the Central Universities (2018CDJSK02XK17)
Article History
Received: 25 October 2019
Accepted: 26 March 2020
First Online: 15 April 2020