1. Department of Cardiovascular and Pulmonary Sciences, Catholic University of the Sacred Heart, Rome, Italy;
2. Department of Cardiovascular Medicine, Fondazione Policlinico Universitario A. Gemelli IRCCS, Rome, Italy;
3. University Campus Bio-Medico, Rome, Italy; and
4. Fondazione Policlinico Universitario Campus Bio-Medico, Rome, Italy.