M. M. A. Nizami, S. A. Mirza, and F. A. Khan, “FREQUENCY OF VITAMIN B12 DEFICIENCY IN PATIENTS WITH HELICOBACTER PYLORI GASTRITIS: Vitamin B12 Deficiency”, Pak Armed Forces Med J, vol. 62, no. 2, pp. 203–5, Jun. 2012, Accessed: Feb. 18, 2025. [Online]. Available: https://pafmj.org/PAFMJ/article/view/1663