Krishnan, G.D. et al. 2020. Prevalence of Vitamin B12 Deficiency and its Associated Factors among Patients with Type 2 Diabetes Mellitus on Metformin from a District in Malaysia. Journal of the ASEAN Federation of Endocrine Societies. 35, 2 (Aug. 2020), 163–168. DOI:https://doi.org/10.15605/jafes.035.02.03.