@article{ávila_freire_2009,  title={7. Doença valvar},  volume={93},  ISSN={0066-782X},  url={https://doi.org/10.1590/S0066-782X2009001300007},  DOI={10.1590/S0066-782X2009001300007},  number={6},  journal={Arquivos Brasileiros de Cardiologia},  publisher={Sociedade Brasileira de Cardiologia - SBC},  author={Ávila, Walkiria Samuel and Freire, Cláudia Maria Vilas},  year={2009},  month={Dec},  pages={126–130} }