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Authors
Yang, Yong
Sun, Chen
Zhou, Yuming
Wang, Tianhe
Zhang, Yiwei
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Article History
Received: 14 April 2015
Revised: 15 January 2016
Accepted: 20 January 2016
First Online: 16 March 2016
Competing interests
: The authors declare no conflict of interest.
Free to read: This content has been made available to all.
