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Authors
Yang, Yan
Wang, Hexi
Gao, Min
Xu, Shuangshan
Xu, Xiaofen
Cao, Xinyu
Tao, Ying
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Article History
Received: 2 July 2014
Accepted: 11 November 2014
First Online: 27 November 2014
Competing interests
: The authors declare no competing financial interests.
