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Authors
Sun, R
Jiang, B
Qi, H
Zhang, X
Yang, J
Duan, J
Li, Y
Li, G
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Article History
Received: 1 August 2015
Revised: 1 August 2015
Accepted: 1 September 2015
First Online: 19 November 2015
Competing interests
: The authors declare no conflict of interest.
