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Authors
Chen, Su-Ren
Tang, J-X
Cheng, J-M
Hao, X-X
Wang, Y-Q
Wang, X-X
Liu, Y-X
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Article History
Received: 4 April 2016
Revised: 17 May 2016
Accepted: 6 June 2016
First Online: 30 June 2016
Competing interests
: The authors declare no conflict of interest.
