Funding for this research was provided by:
Natural Science Foundation of Heilongjiang Province (ZD2017007)
The National Key R&D Program (2017YFD0500600)
Text and Data Mining valid from 2020-01-07
Received: 22 November 2019
Accepted: 21 December 2019
First Online: 7 January 2020
Ethics approval and consent to participate
: This article does not contain any studies with human participants or animals performed by any of the authors.
: Not applicable.
: The authors declare that they have no competing interests.