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Crossover randomised controlled trial.
Follow up period:
Five university outpatient centres, USA; recruitment November 2001 to September 2003.
Sixty six children (89% male) aged 5–14 years with DSM-IV autism, Asperger’s syndrome, or unidentified pervasive development disorder plus hyperactivity and/or impulsiveness for ⩾6 months with onset before age 7. Exclusions: receiving psychotropic medication in previous 1–3 weeks; mental age <18 months; other neuropsychiatric disorders; moderate or severe tic disorder; seizures in the past six months; hypertension; other serious medical comorbidity; methylphenidate treatment in previous two years; previous adverse reaction to …
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