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Sitorus RF. Correlation Between Helicobacter Pylori VacA Antibody Serum and Gastric Premalignant Lesions in Helicobacter Pylori Patients. JSocMed [Internet]. 2023 Nov. 30 [cited 2025 Nov. 15];2(11):348-56. Available from: https://jsocmed.org/index.php/go/article/view/92