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Authors
Liu, Kaipeng
Guo, Yinghui
Pu, Mingbo
Ma, Xiaoliang
Li, Xiong
Luo, Xiangang
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Article History
Received: 27 October 2016
Accepted: 23 December 2016
First Online: 30 January 2017
Competing interests
: The authors declare no competing financial interests.
