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Authors
Mi, Jia
Tian, Geng
Liu, Shuang
Li, Xianglin
Ni, Tianhui
Zhang, Liwei
Wang, Bin
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Article History
Received: 10 February 2015
Accepted: 24 March 2015
First Online: 8 May 2015
Competing interests
: The authors declare no competing financial interests.
