Footnotes

• X @leonardocrlima

• Contributors LA and LL drafted the first version of the manuscript; TC and KN revised the first draft and made substantial improvements to the text; LL drafted the figure; LA, TC and KN revised the figure; LL, TC and KN responded to the reviewers’ comments. All authors read and approved the final version of the manuscript. LL is the guarantor of this manuscript.

• Competing interests None declared.

• Provenance and peer review Not commissioned; externally peer reviewed.