Correction: Cardiac contractility modulation therapy in advanced systolic heart failure

Nat. Rev. Cardiol. 10, 584–598 (2013); doi:10.1038/nrcardio.2013.114 In the version of this article originally published, the address for Alexander R. Lyon was incorrectly stated. The address should have been: NIHR Cardiovascular Biomedical Research Unit, Royal Brompton Hospital, Sydney Street, London, SW3 6NP, UK.