1 Electrophysiology Unit, Cardiology Department, Hospital del Mar, Institut Hospital del Mar Investigacions Mèdiques (IMIM), Universitat Pompeu Fabra, 25-27 Passeig marítim de la Barceloneta, 08003, Barcelona, Spain. ermengolvalles@mac.com.
2 Electrophysiology Unit, Cardiology Department, Hospital del Mar, Institut Hospital del Mar Investigacions Mèdiques (IMIM), Universitat Pompeu Fabra, 25-27 Passeig marítim de la Barceloneta, 08003, Barcelona, Spain.
3 Electrophysiology Unit, Cardiology Department, Hospital de Bellvitge, Universitat Central de Barcelona, Barcelona, Spain.
4 Stony Brook University School of Medicine, Stony Brook, NY, USA.