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Authors
Guan, J-J
Zhang, X-D
Sun, W
Qi, L
Wu, J-C
Qin, Z-H
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Article History
Received: 15 July 2014
Revised: 31 October 2014
Accepted: 17 November 2014
First Online: 29 January 2015
Competing interests
: The authors declare no conflict of interest.
