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Authors
Tian, Yongxiao http://orcid.org/0000-0002-3777-7273
Yang, Xianming
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Funding
Funding for this research was provided by:
National Natural Science Foundation of China (71963034)
the project of philosophy and social sciences of Yunnan Province (QN2019006)
the project of Yunnan University on development economics and innovation hub (C176240103)
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Article History
Received: 3 February 2020
Accepted: 20 July 2020
First Online: 24 July 2020
Compliance with ethical standards
:
: The authors declare that they have no conflicts of interest.
