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Contributors RB drafted the first version. RB and MRD edited and approved the final manuscript.
Funding This work was supported by the British Heart Foundation (PG/19/40/34422) and the Sir Jules Thorn Charitable Trust (15/JTA).
Competing interests None declared.
Patient and public involvement Patients and/or the public were not involved in the design, or conduct, or reporting, or dissemination plans of this research.
Provenance and peer review Commissioned; externally peer reviewed.
Author note References which include a * are considered to be key references.
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