Impulsivity, cognitive function, and their relationship in heroin-dependent individuals. - Zeng, H.; Lee, Tatia M. C.; Waters, J. H.; So, Kwok-Fai; Sham, Pak C.; Schottenfeld, R. S.; Marienfeld, C.; Chawarski, Marek C. (Journal of Clinical & Experimental Neuropsychology, 2013)