Prevalence and Risk Factors of Vitamin B12 Deficiency in Type 2 Diabetes Mellitus Patients on Metformin at a Tertiary Care Center of Nepal. - Sapkota, P.; Tamang, A.; Lamsal, P.; Dhakal, K.; Mahato, A.; Pasakhala, K.; Humagain, S. (Kathmandu University medical journal (KUMJ), 2025)