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Changes in a) cocaine craving, b) urge to use cocaine, c) heroin craving, and d) urge to use heroin as measured by a visual-analog scale recorded as a number between 0 and 1. Baseline measures for each group were set to zero. SEM = standard error of the mean, OT = oxytocin, PL = placebo. †p < 0.10, *p < 0.05, and **p < 0.01.
