Niafar, Mitra, Behrad Jamali, Nasrin Lotfibakhshaiesh, Naser Aghamohammadzadeh, and Nader Nader. “The Role of Metformin on Serum Vitamin B12 Levels in Patients With Type 2 Diabetes Mellitus”. The European Research Journal 1, no. 1 (March 3, 2015): 1–7. Accessed April 5, 2026. https://eurj.org.tr/article/view/1.