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Authors
Zhang, Teng http://orcid.org/0000-0003-3545-390X
Wu, Ji
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Funding
Funding for this research was provided by:
National Natural Science Foundation of China (61571266)
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Article History
Received: 21 November 2017
Accepted: 30 April 2018
First Online: 30 May 2018
Competing interests
: The authors declare that they have no competing interests.
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