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Change in serum 25(OH)D concentrations as measured by LC/MS/MS over 12 mo by intervention group (n = 136 at baseline, n = 133 at 4 mo, and n = 129 at 12 mo). Solid line (triangles) is the vitamin D group; dashed line (circles) is the placebo group. 25(OH)D, 25-hydroxyvitamin D.
