Footnotes

• Handling editor Tahir S Pillay.

• Contributors SG and AF contributed equally to manuscript preparation. VEN also assisted with idea generation, manuscript preparation and guidance throughout project completion.

• 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.