1. Department of Experimental, Diagnostic and Specialty Medicine, Pediatric Cardiology and Adult Congenital Unit; University of Bologna, S.Orsola-Malpighi University Hospital; Bologna Italy
2. Department of Cardiology; IRCCS Bambino Gesù Children's Hospital; Rome Italy
3. Pediatric Cardiology Unit, Department of Pediatrics; University of Padua; Italy
4. Pediatric Cardiology Division; Città Della Salute E Della Scienza - Children's Hospital Regina Margherita; Turin Italy
5. Cardio-Thoracic Department; Città Della Salute E Della Scienza - Children's Hospital Regina Margherita; Turin Italy
6. Pediatric Cardiology, Azienda-Policlinico; Giovanni XXIII Pediatric Hospital; Bari Italy