title: Clinical characterization of patients with chronic tension headache.
authors.forename: M
authors.initials: M
authors.lastname: Langemark
authors.forename: J
authors.initials: J
authors.lastname: Olesen
authors.forename: D L
authors.initials: DL
authors.lastname: Poulsen
authors.forename: P
authors.initials: P
authors.lastname: Bech
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002908:Chronic Disease; D005260:Female; D006261:Headache / Q000503:physiopathology* / Q000628:therapy; D006801:Humans; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D012008:Recurrence