Valvar reoperations - Brandão, C. M. A.; Pomerantzeff, Pablo Maria Alberto; Fonseca, M. H.; Cunha, C. R.; Puig, Luiz Bóro; Cardoso, L. F.; Tarasoutchi, F.; Stolf, Noedir Antônio Groppo (World Congress of the World Society of Cardio-Thoracic Surgeons, 1999)