Statement of ethics committee approval
As an analysis using clinically collected, non-identifiable data, this work does not fall under the remit of National Health Service Research Ethics Committees. This study was approved by our institution’s Research, Quality Improvement and Audit Department with reference FXP-48. This statement is also present in the methods section of our manuscript. It was not appropriate or possible to involve patients or the public in the design, or conduct, or reporting, or dissemination plans of our research.