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Authors
Guo, Xiaonan
Chen, Heng
Long, Zhiliang
Duan, Xujun
Zhang, Youxue
Chen, Huafu
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Article History
Received: 16 May 2016
Accepted: 28 November 2016
First Online: 6 January 2017
Competing interests
: The authors declare no competing financial interests.
