1. Department of Pediatrics and Child Health, Cardiology Division, School of Medicine, Addis Ababa University, Addis Ababa, Ethiopia
2. Department of Surgery, Cardiothoracic Surgery Unit, School of Medicine, Addis Ababa University, Addis Ababa, Ethiopia
3. Department of Cardiovascular Surgery, Ramon y Cajal University Hospital, Madrid, Spain
4. Department of Cardiothoracic Surgery, Pediatric Cardiac Surgery Unit, Niguarda Hospital, Milan, Italy
5. Congenital Cardiac Unit, Leeds Teaching Hospital NHS Trust, Leeds, United Kingdom
6. Department of Cardiothoracic Surgery, Wolfson Medical Center, Holon, Israel
7. Department of Surgery, Pediatric and Adult Congenital Heart Surgery Division, University of Arizona, Tucson, AZ, USA