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Authors
Xue, Zheng-Yuan
Gong, Ming
Liu, Jia
Hu, Yong
Zhu, Shi-Liang
Wang, Z. D.
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Article History
Received: 2 November 2014
Accepted: 22 June 2015
First Online: 28 July 2015
Competing interests
: The authors declare no competing financial interests.
