Funding for this research was provided by:
China Postdoctoral Science Foundation (2015M572431)
the National Natural Science Founding of China (Grant No. 31772127)
the Fundamental Research Funds for the Central Universities (XDJK2017A006, XDJK2017D164)
the Chongqing Postdoctoral Science Special Foundation (Xm2015120)
Text and Data Mining valid from 2019-11-07
Received: 14 May 2019
Accepted: 2 October 2019
First Online: 7 November 2019
Ethics approval and consent to participate
: Not applicable.
: All the authors consent to publish.
: The authors declare no conflict of interest.