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Authors
Feng, W
Xiaoyan, X
Xuan, Y
Xiangke, L
Zichang, Y
Ran, Z
Liuxing, W
Qingxia, F
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Article History
Received: 11 October 2014
Revised: 20 November 2014
Accepted: 21 November 2014
First Online: 9 January 2015
Competing interests
: The authors declare no conflict of interest.
