1. Echocardiography Laboratory, Division of Pediatric Cardiology and Arrhythmology, Department of Pediatric Cardiology and Cardiac Surgery; Bambino Gesù Children Hospital-IRCSS; Rome Italy
2. Division of Cardiac Hemodynamics, Department of Pediatric Cardiology and Cardiac Surgery; Bambino Gesù Children Hospital-IRCSS; Rome Italy
3. Heart and Lung Transplant and Pulmonary Hypertension Unit, Department of Pediatric Cardiology and Cardiac Surgery; Bambino Gesù Children Hospital-IRCSS; Rome Italy