Funding for this research was provided by:
the National Science Foundation of China (31570104, 31970094)
the Program for Jiangsu Excellent Scientific and Technological Innovation Team (17CXTD00014)
Text and Data Mining valid from 2020-01-14
Received: 19 December 2019
Accepted: 26 December 2019
First Online: 14 January 2020
Ethics approval and consent to participate
: This article does not contain any studies with human participants performed by any of the authors.
: All authors gave their consent for publication.
: The authors declare that they have no competing interests.