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Authors
Zhang, Ning
Zhang, Qingfang
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Funding
Funding for this research was provided by:
Beijing Social Science Fund (16YYA006)
National Natural Science Foundation of China (31471074)
Research Funds of Renmin University of China
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Article History
Received: 27 March 2019
Accepted: 19 August 2019
First Online: 10 September 2019
Competing Interests
: The authors declare no competing interests.
