Applying the International Classification of Headache Disorders to the Emergency Department: An Assessment of Reproducibility and the Frequency With Which a Unique Diagnosis Can Be Assigned to Every Acute Headache Presentation

Study objective Although almost 2 decades have passed since the International Headache Society first introduced its International Classification of Headache Disorders (ICHD), the applicability of this classification scheme in the emergency department (ED) has not been assessed. As a first step towar...

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