1. Department of Clinical Cardiology, Policlinico di Monza, Monza, Italy; Department of Cardiology, University of Pavia, Pavia, Italy
2. Department of Clinical Cardiology, Policlinico di Monza, Monza, Italy
3. National Research Council, Institute of Clinical Physiology, ASST Great Metropolitan Hospital Niguarda, Milan, Italy
4. ANMCO Research Center, Florence, Italy
5. Department of Medical and Surgical Sciences, University of Foggia, Foggia, Italy