Ravi, K., Jacob Joseph, and David Mathew Thomas. “Helicobacter Pylori Infection and Vitamin B-12 Deficiency- A Cross Sectional Study”. Asian Journal of Medical Sciences 8, no. 4 (June 30, 2017): 16–20. Accessed November 24, 2024. https://nepjol.info./index.php/AJMS/article/view/17280.