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Authors
Tan, P-x
Du, S-s
Ren, C
Yao, Q-w
Zheng, R
Li, R
Yuan, Y-w
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Article History
Received: 2 May 2014
Revised: 6 August 2014
Accepted: 20 August 2014
First Online: 2 October 2014
Competing interests
: The authors declare no conflict of interest.
