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Authors
Li, Yingxiang
Zhang, Linlin
Qu, Tao
Tang, Xueying
Li, Li
Zhang, Guofan
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Article History
Received: 14 December 2016
Revised: 27 May 2017
Accepted: 31 May 2017
First Online: 6 July 2017
Competing interests
: The authors declare no conflict of interest.
