This hypothesis is based on the fact that a highly significant relationship between serum 25(OH)D and urine deoxypyridinoloine/creatinine (DPD/Cr) was only observed in individuals with 25(OH)D levels below 40 nmol/L but not above this threshold.
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Effects of Vitamin D Supplementation on Bone Turnover Markers: A Randomized Controlled Trial.
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