@article{saadi_2009,  title={Introdução},  volume={24},  ISSN={0102-7638},  url={https://doi.org/10.1590/S0102-76382009000300002},  DOI={10.1590/S0102-76382009000300002},  number={2},  journal={Brazilian Journal of Cardiovascular Surgery},  publisher={Sociedade Brasileira de Cirurgia Cardiovascular},  author={Saadi, Eduardo Keller},  year={2009},  pages={2–2} }