No association between crack-cocaine dependence and functional intronic polymorphism at dopamine D2 receptor gene. - Roman, Tatiana; Stolf, Anderson R.; Akutagava-Martins, G.C.; Müller, D.; Schuch, J.B.; Guimarães, L.S.; Pechansky, F.; Kessler, F.H. (Drug & Alcohol Dependence, 2014)