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Authors
Zhang, H
Zhou, X
Xu, C
Yang, J
Xiang, J
Tao, M
Xie, Y
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Article History
Received: 11 August 2015
Revised: 12 October 2015
Accepted: 16 October 2015
First Online: 13 November 2015
Competing interests
: The authors declare no conflict of interest.
