Zachariah, M., J. Idiculla, and K. Begum. “Serum Vitamin B12 Levels Among Type 2 Diabetic Patients Maintained on Metformin Based Oral Anti-Diabetic Drugs - An Observational Study”. The Indian Journal of Nutrition and Dietetics, vol. 57, no. 2, June 2020, pp. 154-63, doi:10.21048/ijnd.2020.57.2.24629.