Statistics from Altmetric.com
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.
▸ An additional video is published online only. To view this file please visit the journal online (http://dx.doi.org/10.1136/heartjnl-2012-302710).
Competing interests None.
Patient consent Obtained.
Provenance and peer review Not commissioned; internally peer reviewed.