1. Cardio-Thoracic Center, Clínica Girassol, Luanda, Angola
2. Division of Cardiovascular Surgery, Heart Institute (InCor), Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil
3. Cardiology Department, Hospital Militar Principal/Instituto Superior, Luanda, Angola
4. Pediatric Cardiology Department, Cardiac Surgery Department, Portuguese Red Cross Hospital, Lisbon, Portugal