Funding for this research was provided by:
National Natural Science Foundation of China (National Natural Science Fo(NO. 41271268, 40961002,41140009))
Text and Data Mining valid from 2018-11-27
Received: 3 August 2018
Revised: 5 November 2018
Accepted: 9 November 2018
First Online: 27 November 2018
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.