title: Evaluating the IHS criteria.
authors.forename: R B
authors.initials: RB
authors.lastname: Lipton
authors.forename: W F
authors.initials: WF
authors.lastname: Stewart
mesh_terms: D002986:Clinical Trials as Topic / Q000592:standards; D006261:Headache / Q000145:classification* / Q000175:diagnosis; D006801:Humans; D012955:Societies, Medical