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Correlation between serum concentration of 25-hydroxy Vitamin D (25(OH) Vitamin D) (a) and 1,25-hydroxy Vitamin D (1,25(OH)2 Vitamin D) (b) and the value of the visual analog scale (VAS) for quantification of disease-related pain (c); and the value of the modified Laitinen Pain Scale (c and d respectively) in IBD patients (d).
