Footnotes

• Contributors MB and EB drafted the initial manuscript and approved the final manuscript as submitted. FMM and GA critically reviewed the manuscript and approved the final manuscript as submitted.

• Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.

• Competing interests None declared.

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

• Patient consent for publication Obtained.