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Relation between serum 25(OH)D (nmol/L) in a subsample (n = 99) of National Adult Nutrition Survey samples measured by using an IDS ELISA and standardized LC-MS at University College Cork as per Vitamin D Standardization Program protocol 2. The figure shows the piecewise linear fit regression line; the shaded area represents 95% confidence bands. IDS, Immuno Diagnostic Systems Ltd; LC-MS, liquid chromatography–tandem mass spectrometry; 25(OH)D, 25-hydroxyvitamin D.
