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Authors
Li, Quan
Tian, Zhen
Zhang, Xueqian
Singh, Ranjan
Du, Liangliang
Gu, Jianqiang
Han, Jiaguang
Zhang, Weili
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Article History
Received: 24 November 2014
Accepted: 31 March 2015
First Online: 11 May 2015
Competing interests
: The authors declare no competing financial interests.
