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Contrast X-ray imaging of preterm piglets placed in lateral recumbence for taking the X-ray picture (A). The figure also shows a stomach filled with contrast solution (B1, B2), contrast reaching the caecum (C1, C2), and contrast in colon and rectum with a near-empty small intestine (D1, D2). Upper panel: 4 days of age; lower panel: 18 days of age.
