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Authors
Chen, Su-Ren
Chen, M
Deng, S-L
Hao, X-X
Wang, X-X
Liu, Y-X
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Article History
Received: 27 January 2016
Revised: 20 February 2016
Accepted: 25 February 2016
First Online: 24 March 2016
Competing interests
: The authors declare no conflict of interest.
