1. Division of Cardiology, Department of Medicine, Karolinska Institutet, Karolinska University Hospital, Norrbacka S1:02, Stockholm, Sweden
2. Heart and Vascular Theme, Karolinska University Hospital, Stockholm, Sweden
3. St George's Hospital Medical School, London, UK
4. Department of Medical Sciences, IRCCS San Raffaele Pisana, Rome, Italy
5. Faculty of Medicine, University of Warwick, Coventry, UK