1. Department of Cardiology, IDIBAPS, Hospital Clinic of Barcelona, c/Villarroel 170. Escala 3 Planta 6, 08015 Barcelona, Spain
2. Department of Cardiology, Centre Hospitalier Universitaire de Charleroi, Charleroi, Belgium
3. Department of Cardiology, Rigshospitalet, The Heart Centre, Copenhagen, Denmark
4. Department of Cardiology, Fondazione Toscana G. Monasterio, Ospedale del Cuore G. Pasquinucci, Massa, Italy
5. Department of Cardiology, Aarhus University Hospital, Skejby, Denmark