Funding for this research was provided by:
National Science Foundation of China (71771051, 71371049)
the Key Project of Philosophy and Social Science Research in Colleges and Universities in Jiangsu Province (2017ZDIXM014)
Article History
First Online: 3 December 2019
Compliance with ethical standards
:
: The authors declare no conflict of interest.
: This article does not contain any studies with human participants or animals performed by any of the authors.