Al-Hamdi, A., M. Al-Gahhafi, S. Al-Roshdi, S. Jaju, A. Al-Mamari, and A. M. Al Mahrezi. “Vitamin B12 Deficiency in Diabetic Patients on Metformin Therapy: A Cross-Sectional Study from Oman”. Sultan Qaboos University Medical Journal, vol. 20, no. 1, Mar. 2020, pp. e90-94, doi:10.18295/squmj.2020.20.01.013.