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Contributors GSG and AJM conceived and wrote the manuscript.
Funding The British Heart Foundation provides funding support for GSG (FS/16/47/32190, PG/07/068/2334) and AJM (AA/18/3/34220).
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; internally peer reviewed.
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