Funding for this research was provided by:
University of Cumbria (Research Internal Fund)
Received: 20 May 2021
Accepted: 17 September 2021
First Online: 11 October 2021
: Ethical approval was not required for this systematic review and meta-analysis.
: Not applicable as this manuscript does not include any individual person’s data.
: Ross Armstrong and Nicola Relph declare that they have no competing interests with the content of this article.