Nand, L., Mahto, S., Garg, D. K., & Kumar, B. (2020). Vitamin B12 deficiency in patients of type 2 diabetes mellitus treated with metformin: a cross section observational study from a tertiary care centre in Sub-Himalayan region of North India. International Journal of Research in Medical Sciences, 8(4), 1248–1253. https://doi.org/10.18203/2320-6012.ijrms20200997