DRD3 and attention deficit-hyperactivity disorder: In one study, Retz et al. [72] reported an association of the DRD3 polymorphism with impulsiveness according to Eysenck’s EIQ and scores on the German short version of the Wender Utah Rating Scale (WURS-k), which they used for the assessment of a history of attention deficit hyperactivity disorder (ADHD) symptoms.