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Authors
Li, Yuji
Xu, Rui
Lin, Jiazhe
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Funding
Funding for this research was provided by:
the national Science Foundation of China (11371368)
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Article History
Received: 19 December 2017
Accepted: 3 May 2018
First Online: 7 June 2018
Competing interests
: The authors declare that they have no competing interests.
