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Authors
Hu, R
Chen, Z-F
Yan, J
Li, Q-F
Huang, Y
Xu, H
Zhang, X
Jiang, H
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Article History
Received: 5 January 2014
Revised: 29 April 2014
Accepted: 20 May 2014
First Online: 17 July 2014
Competing interests
: The authors declare no conflict of interest.
