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  1. P Hill
  1. Great Ormond Street Hospital for Children NHS Trust, Department of Psychological Medicine, Great Ormond Street Hospital for Children, Great Ormond Street, London WC1N 3JH, UK;

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Professor Peter Hill, Honorary Consultant in Psychological Medicine at Great Ormond Street Children’s Hospital, introduces this supplement on attention deficit/hyperactivity disorder

Attention deficit/hyperactivity disorder (ADHD) is a pattern of pervasive behavioural and cognitive symptoms, characterised by excessive and impairing hyperactive, inattentive, and impulsive behaviour. It is one of the most frequent childhood behavioural disorders, with symptoms often persisting across adolescence into adulthood.

The Diagnostic and Statistical Manual of Diseases - Fourth Revision (DSM-IV)1 allows for the differentiation of ADHD into three subtypes: (1) predominantly inattentive, (2) hyperactive/impulsive, and (3) combined.2 The International Classification of Diseases—10th Revision, (ICD-10)3 is a much narrower diagnosis whereby …

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