Funding for this research was provided by:
Philosophy and Social Science Planning Project of Henan Province, China
Text and Data Mining valid from 2019-08-08
First Online: 8 August 2019
Compliance with ethical standards
: The author confirms that this work is original and has not been published elsewhere nor is it currently under consideration for publication elsewhere and there are no known conflicts of interest associated with this publication.
: This article does not contain any studies with human participants or animals performed by the author.