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Authors
Ma, X
Chen, Y
Zhang, S
Xu, W
Shao, Y
Yang, Y
Li, W
Li, M
Xue, L
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Article History
Received: 21 August 2014
Revised: 21 March 2015
Accepted: 30 March 2015
First Online: 11 May 2015
Competing interests
: The authors declare no conflict of interest.
