SLC6A3 and attention deficit-hyperactivity disorder: Dysfunction in the DAT is implicated in disorders including autism (Hamilton et al., 2013), attention deficit/hyperactive disorder (ADHD) (Mazei-Robison et al., 2008), Parkinson’s disease (Hansen et al., 2014), and the newly characterized infantile Parkinson’s-dystonia known as dopamine transporter deficiency syndrome (DTDS) (Ng et al., 2014).