Abstract
Attention deficit hyperactivity disorder (ADHD) is generally considered to be a developmental disorder and is characterized by a persistent pattern of inattention, distractibility, hyperactivity and impulsivity. Attention deficit disorder (ADD), a subtype of ADHD that lacks the hyperkinetic component, is essentially equivalent to DSM-IV criteria for ADHD of the predominantly inattentive type. ADD was initially thought to be a disease of childhood. However, it is now believed that its symptoms may persist even after attaining adulthood. Due to the lack of visible symptoms, ADD in adults tends to be underdiagnosed compared with that in children. The cause of ADHD remains unknown. It has been reported that a …
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