1 Division of Cardiac Surgical Intensive Care Unit, Department of Intensive Care Medicine and Anesthesiology, "A. Gemelli" Hospital, Catholic University of the Sacred Heart, Rome, Italy Department of Surgery, "A.Gemelli" Hospital, Catholic University of the Sacred Heart, Rome, Italy Department of Infectious Diseases, Infectious Diseases Unit, "A. Gemelli" Hospital, Catholic University of the Sacred Heart, Rome, Italy Department of Surgery, "A.Gemelli" Hospital, Catholic University of the Sacred Heart, Rome, Italy.