Funding for this research was provided by:
National Natural Science Foundation of China (81972193, 81702271)
Department of Science and Technology of Sichuan Province (2019YJ0041)
Research Foundation for Advanced Talents of Ludong University (QDIF2019-1)
Text and Data Mining valid from 2020-09-21
Version of Record valid from 2020-09-21
Article History
Received: 12 May 2020
Accepted: 28 July 2020
First Online: 21 September 2020
Ethics approval and consent to participate
: Not applicable.
: Not applicable.
: The authors declare no potential conflicts of interest with respect to the authorship and/or publication of this article.