title: Hypnic headache syndrome: clinical aspects of eight patients in Brazil.
authors.forename: C A R
authors.initials: CA
authors.lastname: Pinto
authors.forename: Y D
authors.initials: YD
authors.lastname: Fragoso
authors.forename: D
authors.initials: D
authors.lastname: Souza Carvalho
authors.forename: A A
authors.initials: AA
authors.lastname: Gabbai
mesh_terms: D000368:Aged; D001938:Brazil; D005260:Female; D020773:Headache Disorders / Q000175:diagnosis* / Q000188:drug therapy / Q000503:physiopathology*; D006801:Humans; D008297:Male; D008875:Middle Aged