title: Intractable headache criteria.
authors.forename: Marcelo Moraes
authors.initials: MM
authors.lastname: Valença
mesh_terms: D020773:Headache Disorders / Q000145:classification* / Q000175:diagnosis*; D006801:Humans; D017410:Practice Guidelines as Topic; D010818:Practice Patterns, Physicians' / Q000592:standards*