Footnotes

• Twitter @DrAhmirAhmad

• Contributors AA conceived the idea and developed it with BPS. AA wrote the first draft. AA and BPS were involved in manuscript planning, editing, review, and are responsible for overall content.

• 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; externally peer reviewed.