Footnotes

• Contributors NAB: manuscript writing. RN: manuscript corrections. ST-R: manuscript corrections. MS: manuscript corrections, performed surgery.

• 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.

• Patient consent for publication Parental/guardian consent obtained.

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