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Authors
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Funding
Funding for this research was provided by:
the National Natural Science Foundation of China (11771383)
the National Natural Science Foundation of China (11601095)
the Natural Science Foundation of Guangxi Province (2016GXNSFDA380019)
the Natural Science Foundation of Guangxi Province (2014GXNSFFA118001)
Natural Science Foundation of Guangxi Province (2016GXNSFBA380185)
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Article History
Received: 11 December 2018
Accepted: 1 July 2019
First Online: 12 July 2019
Competing interests
: The authors declare that they have no competing interests.
