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A polymorphism at the 3′-untranslated region of the CLOCK gene is associated with adult attention-deficit hyperactivity disorder
Kissling, Christian.  American Journal of Medical Genetics Part B: Neuropsychiatric Genetics.  v. Vol.147B. no. No.3.   2008-04-05. p. 333 - 338... issn: 1552-4841 .   

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