1. Cardiology and Cardiovascular Medicine Department Fondazione Toscana G. Monasterio Pisa Italy
2. Cardiothoracic and Vascular Department University Hospital of Pisa Pisa Italy
3. Institute of Life Sciences Scuola Superiore Sant'Anna Piazza Martiri della Libertà 33 Pisa 56127 Italy
4. CNR Institute of Clinical Physiology Pisa Italy
5. Institute of Cardiology, ASST Spedali Civili di Brescia and Department of Medical and Surgical Specialities, Radiological Sciences and Public Health University of Brescia Brescia Italy