Footnotes

• Twitter @dr_dee_kumar

• Contributors AK wrote the first draft of the manuscript. SW collected the data. AM designed the manuscript. All authors were involved in critical revisions of the manuscript and approve the final 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.

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