1. Department of Cardiovascular Diseases, Azienda Ospedaliera Universitaria Senese, Siena, Italy
2. Department of Medical Biotechnologies, Division of Cardiology, University of Siena, Siena, Italy
3. Department of Medical Biotechnologies, Institute of Pathological Anatomy, University of Siena, Siena, Italy
4. Department of Cardiovascular Diseases, Azienda Ospedaliera Universitaria Senese, Siena, Italy