1. Department of Cardiology, Heart Centre Trier, Barmherzige Brüder Hospital , Nordallee 1, 54296 Trier , Germany
2. Department of Internal Medicine and Cardiology, Herzzentrum Dresden, Technische Universitaet Dresden , Dresden , Germany
3. Department of Cardiology, Royal Brompton and Harefield Hospitals, Guy’s and St Thomas’ NHS Foundation Trust, Harefield Hospital , London, Harefield, UB9 6BJ , UK
4. Cardiovascular Sciences, National Heart and Lung Institute, Imperial College London , UK
5. Institute of Cardiology, Fondazione Policlinico Universitario A. Gemelli IRCCS , 00168 Rome , Italy