@article{stoyanov_dzhenkov_petkova_2021,  title={Primary aortoduodenal fistula: a rare cause of massive gastrointestinal hemorrhage},  volume={11},  ISSN={2236-1960},  url={https://doi.org/10.4322/acr.2021.301},  DOI={10.4322/acr.2021.301},  journal={Autopsy and Case Reports},  publisher={Hospital Universitário da Universidade de São Paulo},  author={Stoyanov, George St. and Dzhenkov, Deyan and Petkova, Lilyana},  year={2021},  pages={e2021301} }