Footnotes

• Contributors OSF—conceiving and designing the study, conceptualisation and writing (original draft). VDP—analysis, methodology and writing (original draft). VNM—analysis, methodology and writing (original draft). DVK—resources and validation. PAV—conceptualisation, supervision and writing (review and editing). LMO—designing the study, supervision 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; externally peer reviewed.