@article{lei_sun_2022,  title={Is atrial fibrillation a preoperative risk factor in elderly patients without heart failure after hip fracture surgery?},  volume={68},  ISSN={0104-4230},  url={https://doi.org/10.1590/1806-9282.20220086},  DOI={10.1590/1806-9282.20220086},  number={4},  journal={Revista da Associação Médica Brasileira},  publisher={Associação Médica Brasileira},  author={Lei, Daoyun and Sun, Jie},  year={2022},  month={Apr},  pages={444–444} }