@article{pitta_roque_pitta_2009,  title={O sexteto mágico da pesquisa clínica},  volume={24},  ISSN={0102-7638},  url={https://doi.org/10.1590/S0102-76382009000200004},  DOI={10.1590/S0102-76382009000200004},  number={2},  journal={Brazilian Journal of Cardiovascular Surgery},  publisher={Sociedade Brasileira de Cirurgia Cardiovascular},  author={Pitta, Guilherme Benjamin Brandão and Roque, Francelise Pivetta and Pitta, Marina Regueira},  year={2009},  month={Apr},  pages={113–115} }