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Authors
Xiang, Yuanjiang
Dai, Xiaoyu
Guo, Jun
Zhang, Han
Wen, Shuangchun
Tang, Dingyuan
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Article History
Received: 23 December 2013
Accepted: 11 June 2014
First Online: 27 June 2014
Competing interests
: The authors declare no competing financial interests.
