Attention deficit hyperactivity disorder in children is found to be related to the occurrence of ADHD in siblings and the male gender, but not to birth order, when compared to healthy controls

Are parental ADHD problems associated with a more severe clinical presentation and greater family adversity in children with ADHD?

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Among a sample of Iranian students, adult attention deficit hyperactivity disorder is related to childhood ADHD, but not to age, gender, socioeconomic status, or birth order—an exploratory study

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Additional Evidence Against Shared Environmental Contributions to Attention-Deficit/Hyperactivity Problems

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Prevalence of adult attention deficit hyperactivity disorder in the relatives of patients with bipolar disorder

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Do Firstborn Children Have an Increased Risk of ADHD?

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The Prevalence of DSM-IV Attention-Deficit/Hyperactivity Disorder: A Meta-Analytic Review

(2012) Erik G. Willcutt   Neurotherapeutics

What causes attention deficit hyperactivity disorder?

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Neuropsychiatric connections of ADHD genes

(2010) J Peter H Burbach   LANCET

Attention-Deficit Hyperactivity Disorder (ADHD) and Birth Order

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Rethinking environmental contributions to child and adolescent psychopathology: A meta-analysis of shared environmental influences.

(2009) S. Alexandra Burt   PSYCHOLOGICAL BULLETIN

Comorbidity of adult attention-deficit hyperactivity disorder and bipolar disorder: prevalence and clinical correlates

(2008) Lut Tamam et al.   EUROPEAN ARCHIVES OF PSYCHIATRY AND CLINICAL NEUROSCIENCE

Subtype differences in adults with attention-deficit/hyperactivity disorder (ADHD) with regard to ADHD-symptoms, psychiatric comorbidity and psychosocial adjustment

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