Funding for this research was provided by:
the Major Projects in Philosophy and Social Science Research from the Ministry of Education of China (14JZD031)
the National Natural Science Foundation of China (71471001)
the National Social Science Fundation Project (17BGL266)
Article History
Received: 23 April 2019
Accepted: 18 November 2019
First Online: 17 December 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.