PRISMA Flow Diagram. AA, arachidonic acid; BM, backward memory; Cog, cognition, Com, commission errors; DHA, docosahexaenoic acid; EPA, eicosapentaenoic acid; FM, forward memory; HI, hyperactivity-impulsivity; IA, inattention; IP, information processing; N-3, omega-3; N-6, omega-6; Om, omission errors.