@article{alışkan_kılıç_2023,  title={Association between ABO blood groups and mortality in upper gastrointestinal bleeding},  volume={69},  ISSN={0104-4230},  url={https://doi.org/10.1590/1806-9282.20230386},  DOI={10.1590/1806-9282.20230386},  number={7},  journal={Revista da Associação Médica Brasileira},  publisher={Associação Médica Brasileira},  author={Alışkan, Halil and Kılıç, Mazlum},  year={2023},  pages={e20230386} }