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Authors
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Funding
Funding for this research was provided by:
Special Innovation Projects of Universities in Guangdong Province, China (No.2018KTSCX)
Natural Science Foundation of Hunan Province (2018JJ2097)
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Article History
Received: 31 July 2019
Accepted: 18 December 2019
First Online: 2 January 2020
Competing interests
: The authors declare that they have no competing interests.
