The narrow-sense and common single nucleotide polymorphism heritability of early repolarization.

RB is a clinical lecturer supported by the National Institute for Health Research. ERB is supported by the Higher Education Funding Council for England and has a research grant from McColl's Ltd. Retail Group. YJ received support and funding from the British Heart Foundation - PG/12/38/29615 and PG/06/094. The TwinsUK study was funded by the Wellcome Trust; European Community's Seventh Framework Programme (FP7/2007-2013). The study also receives support from the National Institute for Health Research (NIHR) BioResource Clinical Research Facility and Biomedical Research Centre based at Guy's and St Thomas' NHS Foundation Trust and King's College London and the British Heart Foundation. Tim Spector is holder of an ERC Advanced Principal Investigator award. SNP Genotyping was performed by The Wellcome Trust Sanger Institute and National Eye Institute via NIH/CIDR. The BRIGHT study was supported by the Medical Research Council of Great Britain (grant number G9521010D); and by the Britisffh Heart Foundation (grant number PG/02/128). The GRAPHIC study was funded by the British Heart Foundation. This work forms part of the research themes contributing to the translational research portfolio for the NIHR Barts Cardiovascular Biomedical Research Centre (Munroe, Warren and Cabrera) and NIHR Leicester Cardiovascular Biomedical Research Centre (Samani). Statistical analyses were carried out on the Genetic Cluster Computer (http://www.geneticcluster.org) hosted by SURFsara and financially supported by the Netherlands Scientific Organization (NWO 480-05-003 PI: Posthuma) along with a supplement from the Dutch Brain Foundation and the VU University Amsterdam.