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Authors
Shi, Yalan
Cui, Shenghui
Ju, Xiaotang
Cai, Zucong
Zhu, Yong-Guan
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Article History
Received: 21 March 2014
Accepted: 2 January 2015
First Online: 29 January 2015
Competing interests
: The authors declare no competing financial interests.
