Agarwal, P., Mital, P., Meena, V. K., Mital, P., Nawal, C. L. and Goyal, L. K. (2016) “A comparative study of levels of vitamin B12 in patients of type 2 diabetes mellitus on metformin and not on metformin at tertiary care center”, International Journal of Advances in Medicine, 3(3), pp. 759–763. doi: 10.18203/2349-3933.ijam20162531.