1. Cardiology and Arrhythmology Clinic, University Hospital “Ospedali Riuniti”, 60126 Ancona, Italy
2. Department of Biomedical Sciences and Public Health, Marche Polytechnic University, 60121 Ancona, Italy
3. Allergology and Clinical Immunology, Reggio Emilia and Medena University, 41121 Modena, Italy
4. Military Hospital Center of Taranto, Cardiology Department, 74100 Taranto, Italy
5. Department of Cardiology, University Medical Center Utrecht, 3584 CX Utrecht, The Netherlands
6. Division of Medicine, Department of Cardiology, Johns Hopkins University, Baltimore, MD 21287, USA
7. Department of Clinical, Special and Dental Sciences, Marche Polytechnic University, 60121 Ancona, Italy
8. Division of Cardiology, Department of Medical and Surgical Sciences, Magna Graecia University, 88100 Catanzaro, Italy