Tovo-Rodrigues, Luciana, Rohde, Luis, Roman, Tatiana, Schmitz, Marcelo, Polanczyk, Guilherme, Zeni, Cristian, Marques, Francine, Contini, Veronica, Grevet, Eugenio, Belmonte-De-Abreu, Paulo, Bau, Claiton, Hutz, Mara. ; 2012. Is there a role for rare variants in DRD4 gene in the susceptibility for ADHD Searching for an effect of allelic heterogeneity.