Philipp Hoffmann1, Till F Althoff1,2,3. 1. Department of Cardiology and Angiology, Charité-University Medicine Berlin, Charité Campus Mitte, Charitéplatz 1, 10117 Berlin, Germany. 2. DZHK (German Centre for Cardiovascular Research), Partner Site Berlin, Berlin, Germany. 3. Cardiology Department, Hospital Clínic Atrial Fibrillation Unit (UFA), Arrhythmia Section, Cardiovascular Institute, Hospital Clínic, Universitat de Barcelona, C/Villarroel N° 170, 08036 Barcelona, Catalonia, Spain.