1 Division of Cardiology, Hospital of Perugia, Italy.
2 Department of Medicine and Surgery, University of Insubria, Italy and Department of Medicine and Cardiopulmonary Rehabilitation, Maugeri Care and Research Institute, IRCCS, Italy.
3 Department of Medicine, and Centro di Ricerca Clinica e Traslazionale (CERICLET), University of Perugia, Italy.