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Authors
Hu, Jing
Li, Gang
Zhang, Peiyuan
Zhuang, Xueqian
Hu, Guohong
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Article History
Received: 28 October 2016
Revised: 20 January 2017
Accepted: 30 January 2017
First Online: 16 March 2017
Competing interests
: The authors declare no conflict of interest.
