HIGH PREVALENCE OF VITAMIN B12 DEFICIENCY IN HELICOBACTER PYLORI-POSITIVE DYSPEPTIC PATIENTS: A CROSS-SECTIONAL STUDY FROM A LOW-INCOME SETTING. Frontier in Medical and Health Research, [S. l.], v. 3, n. 3, p. 216–224, 2025. Disponível em: https://fmhr.net/index.php/fmhr/article/view/230.. Acesso em: 7 aug. 2026.