Investigation of Some Extrinsic Factors Predisposing to Helicobacter Pylori-Associated Vitamin B12 Deficiency Anemia and Diagnosis and Treatment. Journal of Pharmaceutical Negative Results [Internet]. 2022 Oct. 6 [cited 2026 Jun. 26];:1541-50. Available from: https://pnrjournal.com/index.php/home/article/view/1322