“Investigation of Some Extrinsic Factors Predisposing to Helicobacter Pylori-Associated Vitamin B12 Deficiency Anemia and Diagnosis and Treatment”. Journal of Pharmaceutical Negative Results (October 6, 2022): 1541–1550. Accessed June 26, 2026. https://pnrjournal.com/index.php/home/article/view/1322.