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Authors
Zhang, Lei
Niu, Tianhui
Huang, Yafei
Zhu, Haichuan
Zhong, Wu
Lin, Jian
Zhang, Yan
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Article History
Received: 9 January 2015
Accepted: 12 June 2015
First Online: 8 July 2015
Competing interests
: The authors declare no competing financial interests.
