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Authors
Kang, Yan-Fei
Li, Yu-Hao
Fang, Yang-Wu
Xu, Yang
Wei, Xiao-Mi
Yin, Xue-Bo
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Article History
Received: 22 December 2014
Accepted: 30 April 2015
First Online: 2 July 2015
Competing interests
: The authors declare no competing financial interests.
