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Authors
Zhang, Yong
Guo, Xiao
Guo, Jianlin
He, Qiuwen
Li, He
Song, Yuqin
Zhang, Heping
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Article History
Received: 14 February 2014
Accepted: 24 June 2014
First Online: 18 July 2014
Competing interests
: The authors declare no competing financial interests.
