Funding for this research was provided by:
Fundamental Research Funds for the Central Universities (2019CDXYCH0026, 2019CDYGYB028)
Venture and Innovation Support Program for Chongqing Overseas Returnees (cx2018069)
Text and Data Mining valid from 2019-11-04
Received: 22 July 2019
Accepted: 19 October 2019
First Online: 4 November 2019
Ethics approval and consent to participate
: Not applicable.
: The authors declare that they have no competing interests.
: All authors agreed to publish the paper.