1. * Assistant in Cardiology, Department of Cardiac Surgery, “La Sapienza” University of Rome.† Fellow in Cardiology, Department of Cardiac Surgery, “La Sapienza” University of Rome.‡ Associate Professor of Cardiac Surgery, University of Florence.§ Researcher at the Istituto Superiore di Sanità, Ministero della Sanità.¶Associate Professor and Chief of Cardiac Surgery, University of Florence.¶Directo