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Authors
Su, Z
Zang, T
Liu, M-L
Wang, L-L
Niu, W
Zhang, C-L
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Article History
Received: 23 April 2014
Revised: 28 August 2014
Accepted: 3 September 2014
First Online: 16 October 2014
Competing interests
: The authors declare no conflict of interest.
