Muzellina, V. N., Andarini, L., & Syam, A. F. (2026). Etiology of Upper Gastrointestinal Bleeding: A Five-Year Study at a Tertiary Hospital. The Indonesian Journal of Gastroenterology, Hepatology, and Digestive Endoscopy, 27(1), 3–9. https://doi.org/10.24871/27120263-9