Funding for this research was provided by:
Natural Environment Research Council (NE/N013530/1)
Text and Data Mining valid from 2020-05-06
Received: 28 November 2019
Accepted: 22 April 2020
First Online: 6 May 2020
Ethics approval and consent to participate
: Ethical approval was not required for this study as only analysis of existing data was carried out.
: Not applicable.
: All authors declare that they have no competing interests.