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Authors
Chen, Fang
Liu, Jia
Wang, Yanyang
Wu, Tijun
Shan, Wei
Zhu, Yunxia
Han, Xiao
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Article History
Received: 18 March 2015
Accepted: 20 July 2015
First Online: 19 August 2015
Competing interests
: The authors declare no competing financial interests.
