Saint-Antoine university and medical school, université Pierre et Marie Curie, CHU Saint-Antoine, department of cardiology, 184, rue du Faubourg Saint-Antoine, 75571 Paris cedex 12, France. Electronic address: ariel.cohen@sat.aphp.fr. Hospital Bielefeld centre, department of cardiology and internal intensive care, Bielefeld, Germany. René-Descartes university, Georges-Pompidou European hospital, arrhythmia department, Paris, France. Heart centre, Freiburg university, cardiology and angiology I, Freiburg, Germany. Institute of heart and vessels Louis-Mathieu, department of cardiology, Vandœuvre-les-Nancy, France. Winicker Norimed GmbH, Nuremberg, Germany. GlaxoSmithKline, Germany. St-Marien hospital Bonn Venusberg, department of internal medicine, Bonn, Germany. Electronic address: heyder.omran@marien-hospital-bonn.de.