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Authors
Wu, S
Yin, X
Fang, X
Zheng, J
Li, L
Liu, X
Chu, L
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Article History
Received: 8 September 2015
Revised: 14 October 2015
Accepted: 21 October 2015
First Online: 23 November 2015
Competing interests
: The authors declare no conflict of interest.
