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[Correspondence] Bipolar disorder: defining symptoms and comorbidities

In their Seminar, Iria Grande and colleagues wrote that the prevalence of psychiatric and medical comorbidities was high in patients with bipolar disorder.1 Among Diagnostic and Statistical Manual of Mental Disorders axis I diagnoses, bipolar disorder has one of the highest rates of comorbid substance use disorders. In the World Mental Health Survey Initiative,2 61 392 adults from 11 countries in the Americas, Europe, and Asia were assessed using the Composite International Diagnostic Interview—a fully structured psychiatric diagnostic interview.