title: Towards a definition of intractable headache for use in clinical practice and trials.
authors.affiliation: Headache Group, Institute of Neurology, London, UK. peterg@ion.ucl.ac.uk
authors.forename: P J
authors.initials: PJ
authors.lastname: Goadsby
authors.forename: J
authors.initials: J
authors.lastname: Schoenen
authors.forename: M D
authors.initials: MD
authors.lastname: Ferrari
authors.forename: S D
authors.initials: SD
authors.lastname: Silberstein
authors.forename: D
authors.initials: D
authors.lastname: Dodick
mesh_terms: D002986:Clinical Trials as Topic / Q000592:standards*; D020773:Headache Disorders / Q000145:classification*; D006801:Humans; D038622:Internationality; D017410:Practice Guidelines as Topic; D010818:Practice Patterns, Physicians' / Q000592:standards*; D009626:Terminology as Topic