Funding for this research was provided by:
National Natural Science Foundation of China (21706274, 31600635)
the 1000-youth program of China
the Key Research Program of the Chinese Academy of Sciences (ZDRW-ZS-2016-3)
Text and Data Mining valid from 2019-11-12
Received: 25 July 2019
Accepted: 1 November 2019
First Online: 12 November 2019
Ethics approval and consent to participate
: Not applicable.
: All authors consented on the publication of this work.
: The authors declare that they have no competing interests.