Lubis, Ainun, and Gontar Alamsyah Siregar. 2022. “The Differences of Pepsinogen I and H. Pylori Levels in Patients With Gastric Premalignant Lesion”. Journal of Endocrinology, Tropical Medicine, and Infectious Disease (JETROMI) 4 (1):42-49. https://doi.org/10.32734/jetromi.v4i1.8792.