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Authors
Zhao, L-G
Sun, J-W
Yang, Y
Ma, X
Wang, Y-Y
Xiang, Y-B
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Article History
Received: 15 August 2014
Revised: 16 March 2015
Accepted: 6 April 2015
First Online: 13 May 2015
Competing interests
: The authors declare no conflict of interest.
