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Authors
Dong, R
Liu, G-B
Liu, B-H
Chen, G
Li, K
Zheng, S
Dong, K-R
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Article History
Received: 15 December 2015
Revised: 11 March 2016
Accepted: 11 April 2016
First Online: 30 June 2016
Competing interests
: The authors declare no conflict of interest.
