DPP4 and type 2 diabetes mellitus: Six of the T2D patients were diet/exercise controlled; the remaining 26 patients were on various oral antidiabetic medications (n): Metformin (12), sulfonylureas (1), DPP4 inhibitor (1), metformin and DPP4 inhibitor (4), metformin and sulfonylureas (5), sulfonylureas and DPP4 inhibitor (1), metformin, sulfonylureas, and DPP4 inhibitor (1), and metformin, DPP4 inhibitor and thiazolidinedione (1).