title: Headache.
authors.affiliation: The Headache Group, The National Hospital for Neurology and Neurosurgery, London WC1N 3BG.
authors.forename: Anish
authors.initials: A
authors.lastname: Bahra
mesh_terms: D000208:Acute Disease; D002908:Chronic Disease; D003937:Diagnosis, Differential; D020773:Headache Disorders / Q000175:diagnosis* / Q000209:etiology; D006801:Humans; D012008:Recurrence