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Authors
Wang, D
Zhou, Y
Zhuo, C
Qin, W
Zhu, J
Liu, H
Xu, L
Yu, C
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Article History
Received: 26 August 2014
Revised: 6 March 2015
Accepted: 23 April 2015
First Online: 2 June 2015
Competing interests
: The authors declare no conflict of interest.
