title: Headache research methodology.
authors.forename: Richard B
authors.initials: RB
authors.lastname: Lipton
authors.forename: Marcelo E
authors.initials: ME
authors.lastname: Bigal
mesh_terms: D001521:Behavior Therapy; D002986:Clinical Trials as Topic / Q000379:methods / Q000592:standards; D020773:Headache Disorders / Q000628:therapy*; D006801:Humans; D012107:Research Design