Amaral da Silva, Darlan, Cristhian Ayala, and Robert Ayala. “Upper Gastrointestinal Bleeding, Diagnosis and Treatment: A Literature Review”. UNIDA Salud 5, no. 1 (January 26, 2026): 37–42. Accessed November 9, 2026. https://revistacientifica.unida.edu.py/publicaciones/index.php/unidasld/article/view/317.