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Absolute changes in plasma concentrations of cortisol and norepinephrine and salivary cortisol levels after administration of 0.4 (solid lines, n = 18) or 0.8 ng/kg E. coli endotoxin (dashed lines, n = 16). Data are presented as means ± SEM. Significant differences between experimental condition and respective saline control: *p<0.05, **p<0.01, ***p<0.001 (Bonferroni post hoc test).
