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Authors
Liu, Yibo
Xiao, Jingfeng
Ju, Weimin
Zhou, Yanlian
Wang, Shaoqiang
Wu, Xiaocui
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Article History
Received: 2 April 2015
Accepted: 5 August 2015
First Online: 8 September 2015
Competing interests
: The authors declare no competing financial interests.
