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Authors
Chen, G
Zhang, B
Xu, H
Sun, Y
Shi, Y
Luo, Y
Jia, H
Wang, F
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Article History
Received: 20 February 2017
Revised: 19 June 2017
Accepted: 20 July 2017
First Online: 4 September 2017
Competing interests
: The authors declare no conflict of interest.
