Footnotes

• Contributors MESFB, JVCC, MPM, JLP and OGPB: conceptualisation, data curation, formal analysis and writing—original draft preparation, review and editing. MPM acts as a guarantor.

• 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 by Anthony Pereira, London, UK.