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Authors
Xing, Wei
Wu, Haoping
Shi, Qiao
Hao, Beibei
Liu, Han
Wang, Zhixiu
Liu, Guihua
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Article History
Received: 11 August 2014
Accepted: 16 March 2015
First Online: 13 May 2015
Competing interests
: The authors declare no competing financial interests.
