ASKER İhsan, ÇAKMUR H. Investigation of Vitamin B12 Deficiency in Patients with Type 2 Diabetes Mellitus Using Metformin. GNJ [Internet]. 2022 Dec. 5 [cited 2024 Apr. 30];7(21):203-10. Available from: https://gevhernesibedergisi.com/index.php/gnj/article/view/343