Text and Data Mining valid from 2019-02-12
Received: 16 October 2018
Accepted: 6 February 2019
First Online: 12 February 2019
Ethics approval and consent to participate
: The study was approved by the Human Research Ethics Committee of the University of Newcastle (H-2011-0143). Written consent was obtained.
: Not applicable.
: The authors declare that they have no competing interests.
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