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Authors
Yang, H
Peng, T
Li, J
Wang, Y
Zhang, W
Zhang, P
Peng, S
Du, T
Li, Y
Yan, Q
Liu, B
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Article History
Received: 18 May 2015
Revised: 19 January 2016
Accepted: 25 January 2016
First Online: 12 February 2016
Competing interests
: The authors declare no conflict of interest.
