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Contributors Both authors have contributed to this work as follows: (1) substantial contributions to the conception and design, acquisition of data or analysis and interpretation of data; (2) drafting the article or revising it critically for important intellectual content; and (3) final approval of the version to be published.
Funding HBR is supported by a research PhD grant from ‘CNPq, Conselho Nacional de Desenvolvimento Científico e Tecnológico–Brasil’.
Competing interests JR-C is consultant for Edwards Lifesciences and St. Jude Medical.
Provenance and peer review Commissioned; internally peer reviewed.