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Authors
Huang, Junming
Li, Chao
Wang, Wen-Qiang
Shen, Hua-Wei
Li, Guojie
Cheng, Xue-Qi
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Article History
Received: 2 December 2013
Accepted: 8 May 2014
First Online: 18 June 2014
Competing interests
: The authors declare no competing financial interests.
