Received: 20 August 2020
Accepted: 3 January 2021
First Online: 11 January 2021
Ethics approval and consent to participate
: Approval was given following institutional governance review following submission to the Clinical Audit Database at Leeds Teaching Hospitals NHS Trust (reference number not available). In view of the retrospective nature, individual patient consent was waived as appropriate data protection safeguards were in place.
: Not applicable.
: There are no competing interests for any of the authors.