1. Department of Cardiology, Gaia/Espinho Hospital Centre , Rua Conceicao Fernandes, 4434-502, Vila Nova de Gaia, Portugal
2. Cardiovascular R&D Centre, Faculty of Medicine of the University of Porto , Porto, Portugal
3. Department of Cardiology, Complejo Hospitalario Universitario de A Coruña, CIBER-CV, University of A Coruña , A Coruña, Spain
4. European Heart House , Sophia-Antipolis, France
5. Royal Papworth Hospital , Cambridge, UK
6. Department of Cardiovascular Medicine, Fondazione Policlinico Universitario A. Gemelli IRCCS , Rome, Italy
7. Department of Cardiovascular and Pulmonary Sciences, Catholic University of the Sacred Heart , Rome, Italy
8. Royal Brompton and Harefield Hospitals and Imperial College , London, UK