Kanna S. S, Rao Gopisetty S, Naga Siri K, Prakash N, A. P. GK. Metformin Causes Vitamin B12 Deficiency. JCLM [Internet]. 2023 Jan. 27 [cited 2024 Apr. 24];11(1):239-43. Available from: https://www.jclmm.com/index.php/journal/article/view/317