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Authors
Li, Jingxin
Yang, Birong
Shi, Manman
Yuan, Kai
Guo, Wei
Wang, Qian
Wang, Gejiao
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Article History
Received: 1 August 2016
Accepted: 23 January 2017
First Online: 2 March 2017
Competing interests
: The authors declare no competing financial interests.
