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Decreased glomerular filtration rate (GFR) leads to reduced production of 1,25-dihydroxyvitamin D 3 from 25-hydroxyvitamin D 3 (25[OH]D 3 ). Effects of low GFR on vitamin D catabolism are less well understood. We tested associations of estimated GFR (eGFR) with the circulating concentration of 24,25-dihydroxyvitamin D 3 (24,25[OH] 2 D 3 ), the most abundant...
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