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Authors
Chen, L
Xu, S
Xu, Y
Lu, W
Liu, L
Yue, D
Teng, J
Chen, J
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Article History
Received: 30 July 2014
Revised: 7 December 2014
Accepted: 19 December 2014
First Online: 16 March 2015
Competing interests
: The authors declare no conflict of interest.
