Funding for this research was provided by:
Text and Data Mining valid from 2020-02-19
Received: 21 August 2019
Accepted: 6 February 2020
First Online: 19 February 2020
Ethics approval and consent to participate
: Approval was obtained from the University of Exeter’s Research Ethics Committee (2017/1970 (rev2)).
: All authors consent for publication.
: The authors declare that they have no competing interests.