The insulinotropic effect of GIP is impaired in patients with chronic pancreatitis and secondary diabetes mellitus as compared to patients with chronic pancreatitis and normal glucose tolerance - Knop, F K; Vilsbøll, T; Højberg, P V; Larsen, S; Madsbad, S; Holst, J J; Krarup, T (Regul Pept, 2007)