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Footnotes

  • Funding British Heart Foundation, Greater London House, 180 Hampstead Road, London NW1 7AW, UK.

  • Competing interests None.

  • Ethics approval This study was conducted with the approval of the Tayside Committee for Medical Ethics, Ninewells Hospital and Medical School, Dundee DD1 9SY, UK.

  • Patient consent Obtained.

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

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