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Contributors JZ and PS: conception of the draft and final approval of the version to be published. DR: design and drafting the article.
Competing interests None.
Patient consent Obtained.
Provenance and peer review Not commissioned; externally peer reviewed.
▸ Additional material is published online only. To view please visit the journal online (http://dx.doi.org/10.1136/heartjnl-2013-304139).
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