Text and Data Mining valid from 2018-06-19
Received: 17 November 2017
Accepted: 7 June 2018
First Online: 19 June 2018
Ethical approval and consent to participate
: All participants provided their written informed consent for this study, which was approved by Nottingham Trent University’s Ethical Advisory Committee.
: Not applicable.
: The authors declare that they have no competing interests.
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