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Authors
Guo, Liang
Chi, Yayun
Xue, Jingyan
Ma, Linxiaoxi
Shao, Zhiming
Wu, Jiong
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Article History
Received: 8 November 2016
Accepted: 13 February 2017
First Online: 15 March 2017
Competing interests
: The authors declare no competing financial interests.
