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Authors
Li, H.
Gao, B.
Chen, Z.
Zhao, Y.
Huang, P.
Ye, H.
Liu, L.
Liu, X.
Kang, J.
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Article History
Received: 13 May 2015
Accepted: 23 July 2015
First Online: 14 August 2015
Competing interests
: The authors declare no competing financial interests.
