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Authors
Cui, Jianhua
Huang, Cheng
Pan, Wenbo
Pu, Mingbo
Guo, Yinghui
Luo, Xiangang
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Article History
Received: 13 April 2016
Accepted: 8 July 2016
First Online: 29 July 2016
Competing interests
: The authors declare no competing financial interests.
