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Authors
Ji, Yu-he
Guo, Ke
Fang, Shi-bo
Xu, Xiao-niu
Wang, Zhi-gao
Wang, Shu-dong
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Article History
Received: 23 May 2016
Accepted: 9 January 2017
First Online: 8 February 2017
Competing interests
: The authors declare no competing financial interests.
