Dairi, L. et al. 2020. The Comparison of Serum Malondialdehyde Level Between H. pylori Positive and H. pylori Negative Gastritis Patients. The Indonesian Journal of Gastroenterology, Hepatology, and Digestive Endoscopy. 19, 1 (July 2020), 3–6. DOI:https://doi.org/10.24871/19120183-6.