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Authors
Song, Z-H
Yu, H-Y
Wang, P
Mao, G-K
Liu, W-X
Li, M-N
Wang, H-N
Shang, Y-L
Liu, C
Xu, Z-L
Sun, Q-Y
Li, W
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Article History
Received: 4 September 2014
Revised: 3 November 2014
Accepted: 24 November 2014
First Online: 15 January 2015
Competing interests
: The authors declare no conflict of interest.
