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Association between the serum 25(OH)D concentrations measured by LC-MS and RIA for all samples from 72 participants, n = 216. Regression equation: LC-MS 25(OH)D0.1 = 1.02873 + (0.13195)(ln RIA 25(OH)D); R2 = 0.8351; P < 0.0001. Dashed lines = 95% CI.
