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https://doi.org/10.1136/hrt.2010.221093

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    Footnotes

    • Linked article 221085

    • Competing interests None.

    • Ethics approval This study was conducted based on Ethical Approval Ref. 08/H0305/2 from the Cambridgeshire 4 Research Ethics Committee.

    • Provenance and peer review Commissioned; not externally peer reviewed.

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