These results may raise the question “whether ADHD is more prevalent in Turkish children than some other parts of the world?” Considering the migratory origin of Turkish people, which was officially registered with “sella turcica” in anatomy, and the relation between migration and DRD4 gene (one of the most important candidate genes in ADHD etiology) this hypothesis worth to be investigated [37]. The gene discussed is DRD4; the disease is attention deficit-hyperactivity disorder.