Footnotes

• Twitter @osmanhahmed, @Evertverhagen, @adamvirgile

• Contributors RW, OHA, WvM, EV and CB wrote the first draft. AV produced the infographic. All authors provided feedback and content to the final version.

• 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.