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Authors
Yue, Z
Feng, W
Xiangke, L
Liuxing, W
Qingxia, F
Jianbo, G
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Article History
Received: 16 June 2014
Revised: 14 September 2014
Accepted: 15 September 2014
First Online: 7 November 2014
Competing interests
: The authors declare no conflict of interest.
