Funding for this research was provided by:
Text and Data Mining valid from 2019-02-18
Received: 26 July 2018
Accepted: 31 January 2019
First Online: 18 February 2019
: Not applicable.
: Ethical and amendment approval was given by the West of Scotland Research Ethics Committee 5, reference number 17/WS/0020 on 24th January 2017.
: Not applicable
: The authors declare that they have no competing interests.
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