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Authors
Liu, F. S.
Zheng, J. X.
Huang, M. J.
He, L. P.
Ao, W. Q.
Pan, F.
Li, J. Q.
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Article History
Received: 7 February 2014
Accepted: 26 June 2014
First Online: 22 July 2014
Competing interests
: The authors declare no competing financial interests.
