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Authors
Chen, Zhifeng
Yan, Yong
Li, Shufa
Xu, Xiaoguang
Jiang, Yong
Lai, Tianshu
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Article History
Received: 8 September 2016
Accepted: 10 January 2017
First Online: 14 February 2017
Competing interests
: The authors declare no competing financial interests.
