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Authors
Li, Tingting
Liu, Chunjie
Xu, Yuejuan
Guo, Qianqian
Chen, Sun
Sun, Kun
Xu, Rang
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Article History
Received: 5 May 2016
Accepted: 10 October 2016
First Online: 3 November 2016
Competing interests
: The authors declare no competing financial interests.
