Footnotes

• Twitter @Danielskliu

• Contributors DSKL and AEF wrote the manuscript. AEF critically revised the manuscript.

• Funding Royal College of Surgeons of England, UK (to DSKL); Mason Medical Research Trust, UK (to AEF) and the Royal College of Surgeons of Edinburgh, UK (to AEF).

• Competing interests None declared.

• Patient and public involvement Patients and/or the public were not involved in the design, or conduct, or reporting, or dissemination plans of this research.

• Provenance and peer review Commissioned; externally peer reviewed.