RAVI, K.; JOSEPH, Jacob; THOMAS, David Mathew. Helicobacter pylori infection and vitamin B-12 deficiency- A cross sectional study. Asian Journal of Medical Sciences, [S. l.], v. 8, n. 4, p. 16–20, 2017. Disponível em: https://www.nepjol.info/index.php/AJMS/article/view/17280. Acesso em: 10 dec. 2025.