Footnotes

• Twitter @profHoltermann, @Leon_Straker

• Contributors All authors were involved in the conception and planning of the editorial. NG was responsible for initial writing and drafting, which was reviewed and edited by all authors, who approved the final version prior to submission.

• 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.