William Harvey Research Institute, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London, UK. Cardiovascular Research Center, Massachusetts General Hospital, Boston, MA, USA. Program in Medical and Population Genetics, The Broad Institute of MIT and Harvard, Cambridge, MA, USA. deCODE genetics/Amgen, Inc., Reykjavik, Iceland. Department of Cardiology, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands. National Institute for Health Research, Barts Cardiovascular Biomedical Research Centre, Queen Mary University of London, London, UK. College of Health and Life Sciences, Hamad Bin Khalifa University, Education City, Doha, Qatar. Medical Research Council Human Genetics Unit, Institute of Genetics and Molecular Medicine, University of Edinburgh, Edinburgh, UK. Institute for Maternal and Child Health-IRCCS 'Burlo Garofolo', Trieste, Italy. Department of Medicine, Surgery and Health Science, University of Trieste, Trieste, Italy. University of Split School of Medicine, Split, Croatia. Clinical Hospital Centre Split, Split, Croatia. Psychiatric Hospital Sveti Ivan, Zagreb, Croatia. Centre for Global Health Research, Usher Institute of Population Health Sciences and Informatics, University of Edinburgh, Edinburgh, UK. Departamento de Biologia Geral, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil. Rene Rachou Reserch Institute, Oswaldo Cruz Foundation, Belo Horizonte, Minas Gerais, Brazil. Hospital das Clínicas e Faculdade de Medicina, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil. Department of Public Health, Geriatrics, Uppsala University, Uppsala, Sweden. Department of Medicine, Division of Cardiovascular Medicine, Stanford University School of Medicine, Stanford, CA, USA. Stanford Cardiovascular Institute, Stanford University, Stanford, CA, USA. Stanford Diabetes Research Center, Stanford University, Stanford, CA, USA. Department of Medical Sciences, Molecular Epidemiology and Science for Life Laboratory, Uppsala University, Uppsala, Sweden. Wellcome Centre for Human Genetics, University of Oxford, Oxford, UK. Department of Biostatistics, University of Liverpool, Liverpool, UK. Division of Musculoskeletal and Dermatological Sciences, University of Manchester, Manchester, UK. Institute for Biomedicine, Eurac Research, Affiliated Institute of the University of Lübeck, Bolzano, Italy. Medical Sciences, Uppsala University Hospital, Uppsala, Sweden. Nuffield Department of Medicine, Li Ka Shing Centre for Health Information and Discovery, Big Data Institute, University of Oxford, Oxford, UK. Nuffield Department of Medicine, The Wellcome Centre for Human Genetics, University of Oxford, Oxford, UK. The Broad Institute of MIT and Harvard, Cambridge, MA, USA. Department of Medical Sciences, Uppsala University, Uppsala, Sweden. Department of Cardiovascular Sciences, Cardiovascular Research Centre, Glenfield Hospital, University of Leicester, Leicester, UK. NIHR Leicester Biomedical Research Centre, Glenfield Hospital, Groby Road, Leicester, UK. Cardiovascular Department, Azienda Ospedaliera Universitaria Integrata of Trieste, Trieste, Italy. Department of Clinical Physiology, Tampere University Hospital, Tampere, Finland. Department of Clinical Physiology, Faculty of Medicine and Health Technology, Finnish Cardiovascular Research Center Tampere University, Tampere, Finland. Department of Clinical Chemistry, Fimlab Laboratories, Tampere, Finland. Department of Clinical Chemistry, Faculty of Medicine and Health Technology, Finnish Cardiovascular Research Center, Tampere University, Tampere, Finland. Department of Cardiology, Heart Center, Tampere University Hospital, Tampere, Finland. Department of Cardiology, Finnish Cardiovascular Research Center, Faculty of Medicine and Health Technology, Tampere University, Tampere, Finland. Institute of Cardiovascular and Medical Sciences, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow, UK. Institute of Cardiovascular and Medical Sciences, University of Glasgow, Glasgow, UK. Division of Endocrinology, Diabetes, and Nutrition, University of Maryland School of Medicine, Baltimore, MD, USA. Program for Personalized and Genomic Medicine, University of Maryland School of Medicine, Baltimore, MD, USA. Cardiology Division, University Hospital, Basel, Switzerland. Population Health Research Institute, McMaster University, Hamilton, ON, Canada. Institute of Clinical Chemistry, Inselspital Bern, University Hospital, University of Bern, Bern, Switzerland. Labormedizinisches Zentrum Dr. Risch, Vaduz, Liechtenstein. Private University of the Principality of Liechtenstein, Triesen, Liechtenstein. Department of Molecular Biology, Medical Biochemistry and Pathology, Laval University, Quebec, QC, Canada. Department of Pediatrics, Tampere University Hospital, Tampere, Finland. Department of Pediatrics, Faculty of Medicine and Health Technology, Tampere University, Tampere, Finland. Department of Clinical Physiology and Nuclear Medicine, Turku University Hospital, Turku, Finland. Research Centre of Applied and Preventive Cardiovascular Medicine, University of Turku, Turku, Finland. Centre for Population Health Research, University of Turku and Turku University Hospital, Turku, Finland. CARIM School for Cardiovascular Diseases, Maastricht Center for Systems Biology (MaCSBio), Department of Biochemistry, and Department of Physiology, Maastricht University, Maastricht, The Netherlands. Department of Medical Informatics Erasmus MC, University Medical Center Rotterdam, Rotterdam, The Netherlands. Genetic Epidemiology Unit, Department of Epidemiology, Erasmus University Medical Center, Rotterdam, The Netherlands. Icelandic Heart Association, Kopavogur, Iceland. Faculty of Medicine, University of Iceland, Reykjavik, Iceland. Laboratory of Epidemiology and Population Sciences, National Institute on Aging, NIH, Baltimore, MD, USA. School of Public Health, Department of Biostatistics, University of Michigan, Ann Arbor, MI, USA. The Charles Bronfman Institute for Personalized Medicine, Icahn School of Medicine at Mount Sinai, New York, NY, USA. The Mindich Child Health and Development Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA. Jackson Heart Study, Department of Medicine, University of Mississippi Medical Center, Jackson, MS, USA. Department of Data Science, University of Mississippi Medical Center, Jackson, MS, USA. Department of Physiology and Biophysics, University of Mississippi Medical Center, Jackson, MS, USA. DZHK (German Centre for Cardiovascular Research), Munich Heart Alliance, Munich, Germany. Institute of Human Genetics, Helmholtz Zentrum München - German Research Center for Environmental Health, Neuherberg, Germany. Institute of Human Genetics, Klinikum rechts der Isar, Technische Universität München, Munich, Germany. Institute of Genetic Epidemiology, Helmholtz Zentrum München - German Research Center for Environmental Health, Neuherberg, Germany. IBE, Faculty of Medicine, LMU Munich, Munich, Germany. Department of Internal Medicine I (Cardiology), Hospital of the Ludwig-Maximilians-University (LMU) Munich, Munich, Germany. German Center for Diabetes Research, Neuherberg, Germany. Institute of Epidemiology, Helmholtz Zentrum München-German Research Center for Environmental Health, Neuherberg, Germany. Research Unit of Molecular Epidemiology, Helmholtz Zentrum München-German Research Center for Environmental Health, Neuherberg, Germany. Department of Twin Research and Genetic Epidemiology, Kings College London, London, UK. NIHR Biomedical Research Centre at Guy's and St Thomas' Foundation Trust, London, UK. Genomics plc, Oxford, UK. Intermountain Heart Institute, Intermountain Medical Center, Murray, UT, USA. Molecular Cardiology and Biophysics Division, Victor Chang Cardiac Research Institute, Darlinghurst, NSW, Australia. Cardiology Department, St. Vincent's Hospital, Darlinghurst, NSW, Australia. St Vincent's Clinical School, Faculty of Medicine, UNSW Sydney, Kensington, NSW, Australia. Department of Cardiovascular Medicine, University of Iowa, Iowa City, IA, USA. Laboratory for Molecular Cardiology, Department of Cardiology, The Heart Centre, Rigshospitalet, University Hospital of Copenhagen, Copenhagen, Denmark. Department of Biomedical Sciences, University of Copenhagen, Copenhagen, Denmark. Departments of Medicine, Pharmacology, and Biomedical Informatics, Vanderbilt University Medical Center, Nashville, TN, USA. Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, USA. Department of Cardiology, Clinical Sciences, Wallenberg Center for Molecular Medicine, Lund University Diabetes Center, Lund University and Skane University Hospital, Lund, Sweden. Cardiovascular Health Research Unit, Department of Medicine, University of Washington, Seattle, WA, USA. Department of Biostatistics, University of Washington, Seattle, WA, USA. Department of Epidemiology, University of Washington, Seattle, WA, USA. Kaiser Permanente Washington Health Research Institute, Seattle, WA, USA. Cardiology Division, University of Washington, Seattle, WA, USA. Robertson Center for Biostatistics, University of Glasgow, Glasgow, UK. Department of Cardiology, Leiden University Medical Center, Leiden, The Netherlands. Einthoven Laboratory for Experimental Vascular Medicine, Leiden University Medical Center, Leiden, The Netherlands. Institute of Health and Wellbeing, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow, UK. Department of Internal Medicine, section of Gerontology and Geriatrics, Leiden University Medical Center, Leiden, The Netherlands. DZHK (German Centre for Cardiovascular Research), Greifswald, Germany. Department of Internal Medicine B - Cardiology, Pneumology, Infectious Diseases, Intensive Care Medicine, University Medicine Greifswald, Greifswald, Germany. Interfaculty Institute for Genetics and Functional Genomics; Department of Functional Genomics; University Medicine and University of Greifswald, Greifswald, Germany. Finnish Institute for Health and Welfare, Helsinki, Finland. Institute for Molecular Medicine Finland (FIMM), HiLIFE, University of Helsinki, Helsinki, Finland. Institute for Translational Genomics and Population Sciences and Department of Pediatrics, Los Angeles Biomedical Research Institute at Harbor-UCLA Medical Center, Torrance, CA, USA. Cardiovascular Health Research Unit and Department of Epidemiology, University of Washington, Seattle, WA, USA. Institute for Translational Genomics and Population Sciences, Los Angeles Biomedical Research Institute at Harbor-UCLA Medical Center, Torrance, CA, USA. Department of Clinical Epidemiology, Leiden University Medical Center, Leiden, The Netherlands. Department of Public Health and Primary Care, Leiden University Medical Center, Leiden, The Netherlands. Department of Biomedical Sciences, University of Sassari, Sassari, Italy. Laboratory of Genetics and Genomics, NIA/NIH, Baltimore, MD, USA. Laboratory of Cardiovascular Science, NIA/NIH, Baltimore, MD, USA. Population Sciences Branch, Division of Intramural Research, National Heart, Lung, and Blood Institute, Bethesda, MD, USA. National Heart Lung and Blood Institute's and Boston University's Framingham Heart Study, Framingham, MA, USA. Section of Computational Biomedicine, Department of Medicine, Boston University School of Medicine, Boston, MA, USA. Center for Human Genetic Research and Cardiovascular Research Center, Harvard Medical School and Massachusetts General Hospital, Boston, MA, USA. Department of Biostatistics, Boston University School of Public Health, Boston, MA, USA. The Institute of Medical Sciences, Aberdeen Biomedical Imaging Centre, University of Aberdeen, Aberdeen, UK. Centre for Genomic and Experimental Medicine, Institute of Genetics & Molecular Medicine, University of Edinburgh, Western General Hospital, Edinburgh, UK. Centre for Cognitive Ageing and Cognitive Epidemiology, University of Edinburgh, Edinburgh, UK. Division of Population Health and Genomics, Ninewells Hospital and Medical School, University of Dundee, Dundee, UK. Department of Epidemiology Erasmus MC, University Medical Center Rotterdam, Rotterdam, The Netherlands. Human Genotyping Facility Erasmus MC University Medical Center Rotterdam, Rotterdam, The Netherlands. Fred Hutchinson Cancer Research Center, Division of Public Health Sciences, Seattle, WA, USA. Division of Endocrinology, Diabetes and Metabolism, Ohio State University, Columbus, OH, USA. Departments of Epidemiology and Medicine, Gillings School of Global Public Health and School of Medicine, University of North Carolina, Chapel Hill, NC, USA. Department of Epidemiology, Rollins School of Public Health, Emory University, Atlanta, GA, USA. McKusick-Nathans Institute of Genetic Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, USA. Human Genetics Center, University of Texas Health Science Center at Houston, Houston, TX, USA. Cardiology, Geneva University Hospitals, Geneva, Switzerland. Epidemiological Cardiology Research Center, Wake Forest School of Medicine, Winston-Salem, NC, USA. Department of Epidemiology, University of North Carolina, Chapel Hill, NC, USA. Carolina Population Center, University of North Carolina, Chapel Hill, NC, USA. Division of Pharmaceutical Outcomes and Policy, University of North Carolina, Chapel Hill, NC, USA. Barts Heart Centre, St Bartholomews Hospital, London, UK. Institute of Cardiovascular Science, University College London, London, UK. Department of Mechanical Engineering, University College London, London, UK. Department of Medicine, Landspitali University Hospital, Reykjavik, Iceland. School of Engineering and Natural Sciences, University of Iceland, Reykjavik, Iceland. Section of Cardiovascular Medicine and Section of Preventive Medicine, Department of Medicine, Boston University School of Medicine, Boston, MA, USA. Department of Epidemiology, Boston University School of Public Health, Boston, MA, USA. Cardiac Arrhythmia Service, Massachusetts General Hospital, Boston, MA, USA. Genetics Research Centre, Molecular and Clinical Sciences Institute, St George's, University of London, London, UK. Cardiovascular Research Center, Massachusetts General Hospital, Boston, MA, USA. slubitz@mgh.harvard.edu. Program in Medical and Population Genetics, The Broad Institute of MIT and Harvard, Cambridge, MA, USA. slubitz@mgh.harvard.edu. Cardiac Arrhythmia Service, Massachusetts General Hospital, Boston, MA, USA. slubitz@mgh.harvard.edu. William Harvey Research Institute, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London, UK. p.b.munroe@qmul.ac.uk. National Institute for Health Research, Barts Cardiovascular Biomedical Research Centre, Queen Mary University of London, London, UK. p.b.munroe@qmul.ac.uk.