Funding for this research was provided by:
National Natural Science Foundation of China (11871315, 61374089)
Natural Science Foundation of Shanxi Province of China (201801D121003)
Text and Data Mining valid from 2019-11-22
Received: 31 July 2019
Accepted: 19 November 2019
First Online: 22 November 2019
: The authors declare that there is no conflict of interests regarding the publication of this manuscript. The authors declare that they have no competing interests.