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Authors
Wang, Zaihong
Ma, Tiantian
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Funding
Funding for this research was provided by:
National Natural Science Foundation of China (No. 11501381)
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Article History
Received: 26 December 2017
Accepted: 23 June 2018
First Online: 4 July 2018
Competing interests
: The authors declare that they have no competing interests.
