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Authors
Wang, Zhen
Liu, Yuan
Liu, Songbo
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Funding
Funding for this research was provided by:
Humanity and Social Science Youth Foundation of Ministry of Education of China (18YJC630192)
National Natural Science Foundation of China (71971211)
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Article History
Received: 23 June 2019
Accepted: 12 November 2019
First Online: 23 December 2019
Competing interests
: The authors declare that they have no competing interests.
