1. Division of Cardiology, Department of Medical Biotechnologies University of Siena Viale Bracci 1 Siena 53100 Italy
2. Department of Thoracic and Cardiovascular Diseases University of Eastern Piedmont, Maggiore della Carità Hospital Novara Italy
3. Division of Cardiology, Department of Medicine University of Verona Verona Italy
4. Department M3 University of Medicine, Pharmacy, Science, and Technology of Târgu Mureș Târgu Mureș Romania