Effect of single oral doses of sitagliptin, a dipeptidyl peptidase-4 inhibitor, on incretin and plasma glucose levels after an oral glucose tolerance test in patients with type 2 diabetes - Herman, G A; Bergman, A; Stevens, C; Kotey, P; Yi, B; Zhao, P; Dietrich, B; Golor, G; Schrodter, A; Keymeulen, B; Lasseter, K C; Kipnes, M S; Snyder, K; Hilliard, D; Tanen, M; Cilissen, C; De Smet, M; de Lepeleire, I; Van Dyck, K; Wang, A Q; Zeng, W; Davies, M J; Tanaka, W; Holst, J J; Deacon, C F; Gottesdiener, K M; Wagner, J A (J Clin Endocrinol Metab, 2006)