1 Department of Cardiology, Vall d'Hebron University Hospital, Department of Medicine, Universitat Autònoma de Barcelona, Passeig de la Vall d'Hebron 119-129, 08035 Barcelona, Spain.
2 Department of Cardiology, Vall d'Hebron University Hospital, Department of Medicine, Universitat Autònoma de Barcelona, Passeig de la Vall d'Hebron 119-129, 08035 Barcelona, Spain. Electronic address: ignacio.ferreira@vallhebron.cat.