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Authors
Zhang, Yun
Wei, Tiaoxing
Dong, Wenjing
Zhang, Kenan
Sun, Yan
Chen, Xin
Dai, Ning
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Article History
Received: 14 November 2013
Accepted: 14 April 2014
First Online: 9 May 2014
Competing interests
: The authors declare no competing financial interests.
