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Niafar, M., Jamali, B., LotfiBakhshaiesh, N. et al. Effect of metformin on serum vitamin B12 level in patients with type 2 diabetes mellitus. Int J Diabetes Dev Ctries 35, 628–629 (2015). https://doi.org/10.1007/s13410-014-0279-7
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DOI: https://doi.org/10.1007/s13410-014-0279-7