Department of Cardiology, J. W. Goethe University, Theodor-Stern-Kai 7, 60590, Frankfurt, Germany. hohnloser@em.uni-frankfurt.de. Electrophysiology Laboratory and Arrhythmia Service, Johns Hopkins Medical Institutions, Baltimore, MD, USA. Department of Cardiac Electrophysiology, University of Hamburg, Hamburg, Germany. Department of Surgery, University of Toronto, Toronto, ON, Canada. Cardiac and Cardiology Research Department, St. Bartholomew's Hospital, London, UK. Division of Cardiology, Saiseikai Kumamoto Hospital Cardiovascular Center, Kumamoto, Japan. TA Cardiology Medicine, Boehringer Ingelheim International GmbH, Ingelheim am Rhein, Germany. Biostatistics + Data Sciences, Boehringer Ingelheim International GmbH, Ingelheim am Rhein, Germany. Department of Clinical Operations, Boehringer Ingelheim RCV, Vienna, Austria. Cardiac Electrophysiology and Arrhythmia Service, University of California, San Francisco, CA, USA.