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Authors
He, C-H
Pan, S
Ma, Y-T
Yang, Y-N
Ma, X
Li, X-M
Xie, X
Chen, Y
Yu, Z-X
Chen, B-D
Zheng, Y-Y
Liu, F
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Article History
Received: 18 May 2014
Revised: 8 January 2015
Accepted: 31 January 2015
First Online: 18 March 2015
Competing interests
: The authors declare no conflict of interest.
