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Authors
Li, Weihui
Cui, Tao
Hu, Lihua
Wang, Ziqing
Li, Zongqiang
He, Zheng-Guo
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Article History
Received: 31 January 2015
Accepted: 11 August 2015
First Online: 22 September 2015
Competing interests
: The authors declare no competing financial interests.
