Abnormal small intestinal permeability in patients with idiopathic malabsorption in tropics (tropical sprue) does not change even after successful treatment.” Sunil Kumar, Uday C. Ghoshal, Kamaiah Jayalakshmi, Raja Roy, Asha Misra and C. L. Khetrapal. Dig Dis Sci 56, 161-169 (2011).