3 Headache Classification Committee of the International Headache Society. "Classification and diagnostic criteria for headache disorders, cranial neuralgias and facial pain." Cephalalgia. 1988;8(Suppl. 7):1-96.
4 Manack, Aubrey, PhD; Turkel, Catherine, PharmD, PhD; Silberstein, Stephen, MD, FACP. "The Evolution of Chronic Migraine: Classification and Nomenclature." Headache 2009;49:1206-1213.
Medical review by John Claude Krusz, PhD, MD

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