title: High risk clinical characteristics for subarachnoid haemorrhage in patients with acute headache: prospective cohort study.
authors.affiliation: Department of Emergency Medicine, University of Ottawa and Ottawa Hospital Research Institute, Ottawa, Ontario, Canada K1Y 4E9. jperry@ohri.ca
authors.forename: Jeffrey J
authors.initials: JJ
authors.lastname: Perry
authors.forename: Ian G
authors.initials: IG
authors.lastname: Stiell
authors.forename: Marco L A
authors.initials: ML
authors.lastname: Sivilotti
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Bullard
authors.forename: Jacques S
authors.initials: JS
authors.lastname: Lee
authors.forename: Mary
authors.initials: M
authors.lastname: Eisenhauer
authors.forename: Cheryl
authors.initials: C
authors.lastname: Symington
authors.forename: Melodie
authors.initials: M
authors.lastname: Mortensen
authors.forename: Jane
authors.initials: J
authors.lastname: Sutherland
authors.forename: Howard
authors.initials: H
authors.lastname: Lesiuk
authors.forename: George A
authors.initials: GA
authors.lastname: Wells
mesh_terms: D000208:Acute Disease; D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D020773:Headache Disorders / Q000209:etiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D015588:Observer Variation; D011379:Prognosis; D011446:Prospective Studies; D012307:Risk Factors; D013345:Subarachnoid Hemorrhage / Q000150:complications*; D055815:Young Adult