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Authors
Yao, Junyan
Zhang, Shijie
Lim, Loong-Tak
Chen, Xiao
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Article History
Received: 11 November 2016
Revised: 4 January 2017
Accepted: 16 January 2017
First Online: 22 February 2017
Competing interests
: The authors declare no conflict of interest.
Free to read: This content has been made available to all.
