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Authors
Chai, Guoqing
Liu, Weiming
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Funding
Funding for this research was provided by:
the National Nature Science Foundation of China under grant (11601139)
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Article History
Received: 14 May 2018
Accepted: 1 August 2018
First Online: 10 August 2018
Competing interests
: The authors declare that they have no competing interests.
