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Vitamin D status in control patients and patients with inflammatory bowel disease. A: Serum levels of 25-hydroxyvitamin D3 in control and inflammatory bowel disease (IBD) patients (n = 10 patients/group). B: Proportion of control and IBD patients with vitamin D deficiency (< 20 ng/mL). C: Proportion of control and IBD patients with vitamin D insufficiency (< 30 ng/mL).
