PARREIRA, I.; SANTOS, C. A.; ALVES CARDOSO, A. Black Esophagus: A Case of Upper Gastrointestinal Bleeding in a Diabetic Patient. SPMI Case Reports, [S. l.], v. 3, n. 2, p. 66–67, 2025. DOI: 10.60591/crspmi.259. Disponível em: https://casereports.spmi.pt/index.php/cr/article/view/259. Acesso em: 10 aug. 2025.