Funding for this research was provided by:
Fundamental Research Funds for the Central Universities (2019B44914, 2017B17314)
National Natural Science Foundation of China (11771207)
Text and Data Mining valid from 2019-12-01
Received: 19 July 2019
Accepted: 29 November 2019
First Online: 12 December 2019
: The author declares that she has no competing interests regarding the publication of this paper.