Risk Factors and Frequency of Vitamin B12 Deficiency among Patients Visiting Primary Care Clinics in Karachi, Pakistan. Journal of Bahria University Medical and Dental College, [S. l.], v. 15, n. 04, p. 318–325, 2025. DOI: 10.51985/JBUMDC2025546. Disponível em: https://jbumdc.bahria.edu.pk/index.php/jbumdc/article/view/273. Acesso em: 9 may. 2026.