Received: 14 October 2020
Accepted: 8 December 2020
First Online: 10 January 2021
Ethics approval and consent to participate
: Ethical approval was not required for this retrospective analysis. The study was registered as an audit at the local sites. In line with the Health Research Authority decision tool, this study did not require ethical approval.
: Not applicable.
: The authors declare that they have no competing interests.