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Association of change in anandamide in serum and change in the Positive and Negative Symptoms Scale total score in patients treated and observed per protocol. (a) Individual changes of patients treated with cannabidiol (n=14). (b) Individual changes of patients treated with amisulpride (n=8). P-values are from the Wilcoxon signed rank test of the null hypothesis that the distribution of slope is symmetric about zero.
