Funding for this research was provided by:
Economic and Social Research Council (ES/J500100/1)
Text and Data Mining valid from 2019-04-29
Received: 2 November 2018
Accepted: 9 April 2019
First Online: 29 April 2019
Ethics approval and consent to participate
: Ethics approval for the study was given by the School of Medicine, Pharmacy and Health Ethics Sub-committee at Durham University (Ref: ESC2/2016/PP04) on the 7th March 2017. All participants gave informed consent to take part in the study.
: Not applicable.
: The authors declare that they have no competing interests.
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