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Authors
Sun, Y
Peng, S
Yang, A
Farmer, E
Wu, T-C
Hung, C-F
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Article History
Received: 6 December 2016
Revised: 16 February 2017
Accepted: 4 May 2017
First Online: 11 May 2017
Competing interests
: The authors declare no conflict of interest.
Free to read: This content has been made available to all.
