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Serotonin in the two extreme quartiles of aspirin response. Data represent means and 95% confidence intervals of serotonin levels before (blue) and after (red) aspirin exposure in the discovery cohort (a: first quartile n = 42, fourth quartile n = 38) and in the replication cohort (b, first quartile n = 19, fourth quartile n = 19). *P < 0.05, ***P < 0.001.
