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Contributors GM drafted and revised the manuscript. JBM critically appraised and revised the important content within the manuscript. Both authors read and approved the final manuscript.
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 GM is on the editorial board for BMJ Heart.
Provenance and peer review Commissioned; internally peer reviewed.
Author note References which include a * are considered to be key references.