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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 Crohn’s Disease Activity Index for Crohn’s disease (CD) patients (c); and the value of Mayo score (c and d respectively) for ulcerative colitis (UC) patients (d).
