title: Refractory headache definition.
authors.forename: Lawrence
authors.initials: L
authors.lastname: Robbins
mesh_terms: D004185:Disability Evaluation; D006261:Headache / Q000145:classification* / Q000188:drug therapy / Q000517:prevention & control; D006801:Humans; D010148:Intractable Pain / Q000145:classification* / Q000188:drug therapy / Q000517:prevention & control; D015995:Prevalence; D009626:Terminology as Topic