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Authors
Ci, Y
Shi, K
An, J
Yang, Y
Hui, K
Wu, P
Shi, L
Xu, C
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Article History
Received: 2 July 2014
Revised: 6 October 2014
Accepted: 20 October 2014
First Online: 27 November 2014
Competing interests
: The authors declare no conflict of interest.
