Funding for this research was provided by:
National Natural Science Foundation of China (71401063, 71571088)
Guangdong Science and Technology Department (2018A070712023, 2017A070706013)
Text and Data Mining valid from 2019-02-12
First Online: 12 February 2019
Compliance with ethical standards
: We have no conflicts of interest to disclose. We also assure that the article is the authors’ original work, hasn’t received prior publication and isn’t under consideration for publication elsewhere.
: The datasets generated during and/or analyzed during the current study are available from the corresponding author upon reasonable request.