Footnotes

• Contributors KH, EW and JK conceived the project idea. All authors approved the study design. HM, WC, SE, NM, AA and SI collected data and implemented the quality improvement project. All authors contributed to the writing of the final manuscript; all authors approved the final manuscript prior to submission.

• Competing interests None declared.

• Provenance and peer review Not commissioned; internally peer reviewed.

• Data sharing statement No additional data is available elsewhere.

• Correction notice This paper has been amended since it was published Online First. Owing to a scripting error, some of the publisher names in the references were replaced with ‘BMJ Publishing Group’. This only affected the full text version, not the PDF. We have since corrected these errors and the correct publishers have been inserted into the references.