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Vitamin D metabolism and tissue actions. 25(OH)D, 25-hydroxy vitamin D; Ca2+, calcium; CRP, C-reactive protein; DBP, vitamin D binding protein; DM, diabetes mellitus; MMP9, matrix metalloproteinase 9; PO4, phosphate; PTH, parathyroid hormone; SGA, small for gestational age; UVB, ultraviolet B.
