During the seasons, 25(OH)D serum levels showed an increasing trend from spring to summer, then a clear decreasing trend from summer to fall to the lowest levels in winter.
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Establishment of Reference Intervals for Bone Turnover Biomarkers in Healthy Populations in Northern China.
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The sentences
OC, β-CTX and P1NP showed a trend of decreasing in spring to summer, and then further increased in fall and winter.