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Plasma glucose-dependent insulinotropic polypeptide (GIP) concentrations following enteral or iv administration of glucose. A: gastric and jejunal administrations of glucose. B: gastric and isoglycemic iv administrations of glucose. C: jejunal and isoglycemic iv administrations of glucose. D: AUCs for enteral administrations of glucose and the corresponding isoglycemic iv glucose matches. **P ≤ 0.01; ***P ≤ 0.001.
