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Authors
Luo, Xian-Gang
Pu, Ming-Bo
Li, Xiong
Ma, Xiao-Liang
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Article History
Received: 17 October 2016
Revised: 28 December 2016
Accepted: 3 January 2017
First Online: 6 January 2017
Competing interests
: The authors declare no conflict of interest.
