Funding for this research was provided by:
National Natural Science Foundation of China (No. 31301470)
Text and Data Mining valid from 2019-08-03
Received: 25 May 2019
Accepted: 24 July 2019
First Online: 3 August 2019
Compliance with Ethical Standards
: Jinxing He declares that he has no conflict of interest. Yuxia Huang declares that she has no conflict of interest. Tao Zhao declares that she has no conflict of interest.
: This article does not contain any studies with human participants or animals performed by any of the authors.
: Not applicable