Funding for this research was provided by:
National Natural Science Foundation of China (31572164, 30972030)
National Key Research and Development Project (2018YFD1000407)
Text and Data Mining valid from 2019-11-01
Received: 2 June 2019
Accepted: 10 October 2019
First Online: 1 November 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: This article does not contain any studies conducted on human or animal subjects.