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Authors
Chen, Yun
Gao, Qixun
Huang, Mengmeng
Liu, Ye
Liu, Zunyong
Liu, Xin
Ma, Zhonghua
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Article History
Received: 10 September 2014
Accepted: 26 June 2015
First Online: 27 July 2015
Competing interests
: The authors declare no competing financial interests.
