The aggregate effect of dopamine genes on dependence symptoms among cocaine users: Cross-validation of a candidate system scoring approach

Jaime Derringer, Robert F. Krueger, Danielle M. Dick, Fazil Aliev, Richard A. Grucza, Scott Saccone, Arpana Agrawal, Howard J. Edenberg, Alison M. Goate, Victor M. Hesselbrock, John R. Kramer, Peng Lin, Rosalind J. Neuman, John I. Nurnberger, John P. Rice, Jay A. Tischfield, Laura J. Bierut