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Authors
Wang, Kun
Yan, Xiong
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Funding
Funding for this research was provided by:
Program on General project of Hunan Provincial Education Department (17C0390)
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Article History
Received: 18 September 2018
Accepted: 2 November 2018
First Online: 19 November 2018
Competing interests
: The authors declare that they have no competing interests.
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