1. Department of Congenital Cardiac Surgery, IRCCS Policlinico San Donato, San Donato Milanese, Italy
2. Mediterranean Pediatric Cardiac Surgery Unit, San Vincenzo Hospital, Taormina, Italy
3. Pediatric and Grown-up Congenital Cardiac Surgery, University of Bologna, S. Orsola-Malpighi Hospital, Bologna, Italy
4. Pediatric and Congenital Cardiac Surgery Unit, Department of Surgery, Dentistry, Pediatrics and Gynecology, University of Verona, Verona, Italy
5. Pediatric Cardiac Surgery Unit, Grande Ospedale Metropolitano Niguarda, Milan, Italy
6. Pediatric Cardiac Surgery, Regina Margherita Children’s Hospital, Turin, Italy
7. Congenital Cardiac Surgery Unit, Monaldi Hospital, Naples, Italy
8. Pediatric Cardiology and Cardiac Surgery Unit, Cardiovascular Department, Papa Giovanni XXIII Hospital, Bergamo, Italy
9. Pediatric Cardiac Surgery Unit, Federico II Hospital, Naples, Italy
10. Pediatric and Adult Congenital cardiac Surgery Unit, Heart Hospital, Massa, Italy
11. Pediatric Cardiac Surgery Unit, Ospedali Riuniti, Ancona, Italy
12. Pediatric Cardiac Surgery Unit, Giovanni XXII Children’s Hospital, Bari, Italy
13. Pediatric and Congenital Cardiac Surgery Unit, Department of Cardiac, Thoracic and Vascular Sciences, Padova University Hospital, Padova, Italy
14. Department of Pediatric Cardiac Surgery, Bambino Gesù Children’s Hospital IRCCS, Rome, Italy