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The article you requested is

Overview of Generalized Anxiety Disorder: Epidemiology, Presentation, and Course

J Clin Psychiatry 2009;70(suppl 2):4-9

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Generalized anxiety disorder (GAD) was defined relatively recently, and the diagnostic criteria are still being refined. The essential feature of the disorder has changed from persistent anxiety to excessive worry, and the required symptom duration has changed from 1 month to 6 months. Additionally, exclusion criteria involving permissibility of the diagnosis in children and wording regarding the relationship of GAD with mood disorders have changed. Nosologic controversies still surround the criteria for excessive worry, symptom duration, the relationship between GAD and major depressive disorder, and the required number of associated symptoms.​