1 Department of Cardiology and University Hospital Vall d'Hebron, Autonomous University of Barcelona, CIBERCV, Centro Investigación Biomédica en red Cardiovascular, Barcelona, Spain, asambola@vhebron.net.
2 Research Institute, University Hospital Vall d'Hebron, Autonomous University of Barcelona, Barcelona, Spain, asambola@vhebron.net.
3 Department of Cardiac Electrophysiology and Arrhythmology, IRCCS San Raffaele Hospital and Vita-Salute University, Milan, Italy.