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Authors
Yang, Hua
Liu, Zhiyong
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Funding
Funding for this research was provided by:
The Science and Technology Research Project of Department of Education of Guangxi (2019KY0815)
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Article History
Received: 13 February 2019
Accepted: 18 April 2019
First Online: 16 May 2019
Competing interests
: The authors declare that they have no competing interests.
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