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Authors
Chen, Zhongbo
Xu, Zhiwei
Sun, Shifang
Yu, Yiming
Lv, Dan
Cao, Chao
Deng, Zaichun
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Article History
Received: 4 March 2014
Accepted: 18 June 2014
First Online: 7 July 2014
Competing interests
: The authors declare no competing financial interests.
