Funding for this research was provided by:
National Natural Science Foundation of China (31871784, 31870069, 21676119)
Text and Data Mining valid from 2019-12-14
Received: 28 July 2019
Revised: 19 September 2019
Accepted: 24 September 2019
First Online: 14 December 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: This article does not contain any studies with human participants or animals performed by any of the authors.