@article{aktan_güzel_2023,  title={Prognostic value of age, creatinine, and left ventricular ejection fraction risk score in patients evaluated with fractional flow reserve: a cross-sectional study},  volume={69},  ISSN={0104-4230},  url={https://doi.org/10.1590/1806-9282.20230533},  DOI={10.1590/1806-9282.20230533},  number={8},  journal={Revista da Associação Médica Brasileira},  publisher={Associação Médica Brasileira},  author={Aktan, Adem and Güzel, Tuncay},  year={2023},  pages={e20230533} }