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Authors
Wang, L
Song, G
Chang, X
Tan, W
Pan, J
Zhu, X
Liu, Z
Qi, M
Yu, J
Han, B
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Article History
Received: 5 May 2014
Revised: 29 September 2014
Accepted: 30 October 2014
First Online: 15 December 2014
Competing interests
: The authors declare no conflict of interest.
