Gastrointestinal Manifestations and Neutrophil-to-Lymphocyte Ratio as Marker of Occult Bleeding in COVID -19. IJIHS [Internet]. 2025 Oct. 30 [cited 2026 Jul. 23];13(2):131-7. Available from: https://journal.fk.unpad.ac.id/index.php/ijihs/article/view/4210