@article{liguori_moreira_2018,  title={Operating with Data - Statistics for the Cardiovascular Surgeon: Part III. Comparing Groups},  volume={33},  ISSN={0102-7638},  url={https://doi.org/10.21470/1678-9741-2018-0378},  DOI={10.21470/1678-9741-2018-0378},  number={6},  journal={Brazilian Journal of Cardiovascular Surgery},  publisher={Sociedade Brasileira de Cirurgia Cardiovascular},  author={Liguori, Gabriel Romero and Moreira, Luiz Felipe Pinho},  year={2018},  month={Nov},  pages={V–X} }