@article{avila_grinberg_1999,  title={Pregnancy does not cause structural bioprosthesis alteration},  volume={72},  ISSN={0066-782X},  url={https://doi.org/10.1590/S0066-782X1999000400001},  DOI={10.1590/S0066-782X1999000400001},  number={4},  journal={Arquivos Brasileiros de Cardiologia},  publisher={Sociedade Brasileira de Cardiologia - SBC},  author={Avila, Walkiria Samuel and Grinberg, Max},  year={1999},  month={Apr},  pages={403–404} }