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Relationship between [11C](+)PHNO BPND change in limbic striatum (LST), rate of smoking (puff number) and urge to smoke to relieve the negative affect (QSU/Factor 2; see in text for details on calculation). Pearson correlation coefficients (uncorrected r) and partial correlations coefficients (corrected r, controlling for the order of visits) are presented; *P<0.05.
