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Authors
Li, Lingliang
Zhang, Fujun
Wang, Jian
An, Qiaoshi
Sun, Qianqian
Wang, Wenbin
Zhang, Jian
Teng, Feng
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Article History
Received: 3 November 2014
Accepted: 20 February 2015
First Online: 17 March 2015
Competing interests
: The authors declare no competing financial interests.
