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Authors
Li, Jing
Xu, Gang
Chen, Xiu-Bo
Qu, Zhiguo
Niu, Xin-Xin
Yang, Yi-Xian
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Article History
Received: 4 May 2017
Accepted: 9 November 2017
First Online: 1 December 2017
Competing Interests
: The authors declare that they have no competing interests.
