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Serum concentrations of 25-hydroxy Vitamin D (25(OH) Vitamin D) (a) and 1,25-hydroxy Vitamin D (1,25(OH)2 Vitamin D) (b) in Crohn’s disease (CD) and ulcerative colitis (UC) patients supplementing (sup.) or not supplementing (not sup.) vitamin D with over-the-counter (OTC) drugs.
