Footnotes

• Contributors SA—data curation. BT—conceptualisation, methodology and writing (reviewing and editing). ES—original draft preparation and software. OE—supervision, visualisation, investigation and validation.

• 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; internally peer reviewed.