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Authors
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Funding
Funding for this research was provided by:
Hunan Provincial Innovation Foundation for Postgraduate (CX20190041)
National Natural Science Foundation of China (71571186)
National Natural Science Foundation of China (61703416)
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Article History
Received: 30 September 2019
Accepted: 2 February 2020
First Online: 14 February 2020
Competing interests
: The authors declare no competing interests.
