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Authors
Duan, Xing
Wang, Qiao-Chu
Chen, Kun-Lin
Zhu, Cheng-Cheng
Liu, Jun
Sun, Shao-Chen
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Article History
Received: 8 December 2014
Accepted: 15 May 2015
First Online: 25 June 2015
Competing interests
: The authors declare no competing financial interests.
