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Authors
Su, Ya-Juan
Ma, Ze-Xin
Huang, Jian-Hua
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Article History
Received: 16 January 2016
Revised: 13 March 2016
Accepted: 15 March 2016
First Online: 18 May 2016
Competing interests
: The authors declare no conflict of interest.
Free to read: This content has been made available to all.
