[1] Univ Siena, Dept Med Biotechnol, Div Cardiol, Siena, Italy
[2] Univ Perugia, S Maria Misericordia Hosp, Cardiol & Cardiovasc Pathophysiol, Perugia, Italy
[3] Univ Brescia, Inst Cardiol, Dept Med & Surg Specialties Radiol Sci & Publ Hlth, Brescia, Italy