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Attention deficit hyperactivity disorder

Attention deficit-hyperactivity disorder (ADHD) also known as hyperkinetic disorder (HKD) is a mental disorder and neurobehavioral disorder characterized by either significant difficulties of inattention or hyperactivity and impulsiveness or a combination of the two. According to the Diagnostic and Statistical Manual of Mental Disorders (DSM-IV-TR), symptoms emerge before seven years of age.

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