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Authors
Lou, C
Xiao, M
Cheng, S
Lu, X
Jia, S
Ren, Y
Li, Z
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Article History
Received: 9 September 2015
Revised: 14 December 2015
Accepted: 3 January 2016
First Online: 24 March 2016
Competing interests
: The authors declare no conflict of interest.
