1. Department of Cardiology, S. Luca Hospital, IRCCS, Istituto Auxologico Italiano, Milan, Italy
2. Division of Geriatric and Intensive Care Medicine, University of Florence and Azienda Ospedaliero Universitaria Careggi, Florence, Italy
3. Department of Cardiology, Karolinska University Hospital, and Department of Medicine, Karolinska Institute, Sweden