Footnotes

• Handling editor Vikram Deshpande.

• Contributors JJMLH performed the literature research and wrote the manuscript. EU initiated the manuscript, contributed content and reviewed all versions.

• 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.