Sitorus, Ridho Firmansyah. “Correlation Between Helicobacter Pylori VacA Antibody Serum and Gastric Premalignant Lesions in Helicobacter Pylori Patients”. Journal of Society Medicine 2, no. 11 (November 30, 2023): 348–356. Accessed June 29, 2025. https://www.jsocmed.org/index.php/go/article/view/92.