title: The riddle of association, causation and the prevention of subarachnoid haemorrhage.
authors.forename: Issam
authors.initials: I
authors.lastname: Awad
mesh_terms: D005260:Female; D006801:Humans; D008297:Male; D012907:Smoking / Q000009:adverse effects*; D016540:Smoking Cessation / Q000706:statistics & numerical data*; D013345:Subarachnoid Hemorrhage / Q000453:epidemiology*