Article
Tourette's syndrome and attention-deficit hyperactivity disorder: evidence for a genetic relationship.
The Journal of clinical psychiatry - 1 Sept 1993
Knell E R, Comings D E
Abstract excerpt
BACKGROUND: Attention deficit disorder with or without hyperactivity (ADD) is present in 49% to 83% of patients with Tourette's syndrome (TS), and up to 50% of children with attention-deficit hyperactivity disorder (ADHD) have chronic tics or a family history of chronic tics. Two explanations have been offered for this association: (1) ADHD is part of the pleiotropic expression of the Gilles de la Tourette (Gts)...
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