Funding for this research was provided by:
Grantová Agentura České Republiky (GA15-15286S)
National Natural Science Foundation of China (61673250)
Text and Data Mining valid from 2018-03-15
First Online: 15 March 2018
Compliance with ethical standards
: Author Jiří Janda declares that he has no conflict of interest. Author Yongjian Xie declares that he has no conflict of interest.
: This article does not contain any studies with human participants or animals performed by any of the authors.