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Objectives There is debate surrounding the adequacy of total and free 25 hydroxy vitamin D [25(OH)D] levels in black Americans who have inherently high bone mineral density [BMD] and low serum concentration of vitamin D binding proteins [VDBP]. Design Retrospective analysis of serum samples and BMD analyses from the African American Health Study [AAHS] cohort. Setting The AAHS is a population-based...