Funding for this research was provided by:
National Natural Science Foundation of China (41304015, 61671461)
Postdoctoral Research Foundation of China (2015M582813)
Text and Data Mining valid from 2019-11-08
First Online: 8 November 2019
Compliance with ethical standards
: All 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.