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Authors
Xiao, Jinzhou
Liu, Liyuan
Ke, Yiyun
Li, Xiefei
Liu, Yunfei
Pan, Yingjie
Yan, Shuling
Wang, Yongjie
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Article History
Received: 21 July 2016
Accepted: 6 January 2017
First Online: 7 February 2017
Competing interests
: The authors declare no competing financial interests.
