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Authors
Ma, X
Zhang, Y-L
Ji, Q
Xing, Y
Pan, H
Chen, S
Tang, J-L
Zhu, S
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Article History
Received: 22 December 2016
Revised: 2 March 2017
Accepted: 8 March 2017
First Online: 17 May 2017
Competing interests
: The authors declare no conflict of interest.
