Figure 1: The drug therapy based on assessment of postprandial blood sugar (PPBS). Group 1: metformin alone; Group 2: metformin + glimepiride; Group 3: metformin + glimepiride + a thiazolidinedione; Group 4: metformin + a thiazolidinedione; Group 5: metformin + glimepiride + insulin + thiazolidinedione.