@article{li_tang_2023,  title={Comment on “Serum vascular endothelial growth factor as a marker for tubal pregnancy”},  volume={69},  ISSN={0104-4230},  url={https://doi.org/10.1590/1806-9282.20221238},  DOI={10.1590/1806-9282.20221238},  number={1},  journal={Revista da Associação Médica Brasileira},  publisher={Associação Médica Brasileira},  author={Li, Zhijiao and Tang, Jie},  year={2023},  month={Jan},  pages={8–8} }