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Changes in serum concentrations of total, free, and bioavailable 25‐OHD and 1,25(OH)2D3 and 24,25(OH)2D3 after the surgical stress response. Data are presented as mean ± SEM normalized to the average concentration preoperatively and stratified according to sex. *p < 0.05, **p < 0.01, ***p < 0.001 (black asterisks = men; red asterisks = women).
