Footnotes

• X @FabinNatalia, @RosselloXavier

• Contributors NF drafted the manuscript following the outline provided by XR. Then there were three rounds of revisions where comments raised by XR were subsequently addressed by NF. XR is the 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 Commissioned; internally peer reviewed.