Footnotes

• Contributors ZSA is the lead author of the letter. MPS and JGM revised the manuscript. PRG supervised and edited the manuscript.

• 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 Not required.

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