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Attention deficit hyperactivity disorder

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Attention deficit hyperactivity disorder (ADHD) is a common diagnosis among children. Wikipedia NIMH

There is ongoing controversy about ADHD: is it a normal variation with benefits that are currently not recognized, a treatable medical condition, or simply a diagnosis applied mainly to children who are younger than their classroom peers? For a recent news article on this controversy, see [1].

A 2009 meta-analysis of 75 separate studies found no association between ADHD and SNPs in the SLC6A4 or HTR1B genes. [PMID 19721846]

Various genes may affect susceptibility to ADHD, and some may also affect the risk of substance abuse disorders. [PMID 18821565]