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Authors
Zhu, S
Zhang, J
Xu, F
Xu, E
Ruan, W
Ma, Y
Huang, Q
Lai, M
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Article History
Received: 20 August 2014
Revised: 2 February 2015
Accepted: 5 February 2015
First Online: 19 March 2015
Competing interests
: The authors declare no conflict of interest.
