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Test of the ICHD-3 criteria (beta version) in patients with sudden headache. *One patient had single headache lasting < 5 minutes. Moderate headache intensity refers to 4-6 on a 0-10 numerical rating scale. ICHD: International Classification of Headache Disorders; RCVS: reversible cerebral vasoconstriction syndrome; HSA: headache associated with sexual activity.
