Letter: economic impact of combining metformin with dipeptidyl peptidase-4 inhibitors in diabetic patients with renal impairment in spanish patients (diabetes metab j 2015;39:74-81)

Letter: economic impact of combining metformin with dipeptidyl peptidase-4 inhibitors in diabetic patients with renal impairment in spanish patients (diabetes metab j 2015;39:74-81)