Footnotes

• Twitter @Zainab_arslan_

• Contributors ZA conceived, wrote and reviewed. MAK wrote and reviewed. MDS wrote and reviewed.

• 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 Commissioned; externally peer reviewed.