PANKIV, V. Association between metformin use and vitamin B12 deficiency in patients with type 2 diabetes. INTERNATIONAL JOURNAL OF ENDOCRINOLOGY (Ukraine), [S. l.], v. 15, n. 1, p. 38–43, 2019. DOI: 10.22141/2224-0721.15.1.2019.158691. Disponível em: http://iej.zaslavsky.com.ua/article/view/158691. Acesso em: 6 dec. 2021.