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Authors
Zhang, R
Wu, W R
Shi, X D
Xu, L B
Zhu, M S
Zeng, H
Liu, C
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Article History
Received: 30 July 2015
Revised: 26 November 2015
Accepted: 13 December 2015
First Online: 29 February 2016
Competing interests
: The authors declare no conflict of interest.
