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Authors
Ning, Nannan
Zhu, Jianchun
Du, Yahui
Gao, Xiaolin
Liu, Chuanyong
Li, Jingxin
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Article History
Received: 27 February 2014
Accepted: 13 May 2014
First Online: 10 June 2014
Competing interests
: The authors declare no competing financial interests.
