Prevention of stroke.
D000368:Aged; D001241:Aspirin / Q000627:therapeutic use; D002170:Canada; D002561:Cerebrovascular Disorders / Q000453:epidemiology / Q000401:mortality / Q000517:prevention & control*; D002986:Clinical Trials as Topic; D004176:Dipyridamole / Q000627:therapeutic use; D005260:Female; D006493:Heparin / Q000627:therapeutic use; D006801:Humans; D002542:Intracranial Embolism and Thrombosis / Q000517:prevention & control; D008297:Male; D008875:Middle Aged; D010919:Placebos; D010974:Platelet Aggregation / Q000187:drug effects; D011897:Random Allocation; D012306:Risk; D012737:Sex Factors; D013442:Sulfinpyrazone / Q000627:therapeutic use; D014481:United States; D014859:Warfarin / Q000627:therapeutic use
D010919:Placebos; D014859:Warfarin; D004176:Dipyridamole; D006493:Heparin; D001241:Aspirin; D013442:Sulfinpyrazone