Krishnan, Gayathri Devi, Miza Hiryanti Zakaria, and Norhayati Yahaya. “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, no. 2 (August 24, 2020): 163–168. Accessed March 29, 2024. https://asean-endocrinejournal.org/index.php/JAFES/article/view/803.