title: Headache classification update 2004.
authors.affiliation: Danish Headache Center, University of Copenhagen, Denmark. jeol@glostruphosp.kbhamt.dk
authors.forename: Jes
authors.initials: J
authors.lastname: Olesen
authors.forename: Richard B
authors.initials: RB
authors.lastname: Lipton
mesh_terms: D003027:Cluster Headache / Q000145:classification / Q000175:diagnosis; D003937:Diagnosis, Differential; D006261:Headache / Q000145:classification* / Q000175:diagnosis; D006801:Humans; D008881:Migraine Disorders / Q000145:classification / Q000175:diagnosis; D012955:Societies, Medical; D018781:Tension-Type Headache / Q000145:classification / Q000175:diagnosis