title: Warfarin trumps aspirin for stroke prevention in elderly.
mesh_terms: D000368:Aged; D000925:Anticoagulants / Q000008:administration & dosage*; D001241:Aspirin / Q000008:administration & dosage*; D001281:Atrial Fibrillation / Q000150:complications*; D006801:Humans; D020521:Stroke / Q000209:etiology / Q000517:prevention & control*; D014859:Warfarin / Q000008:administration & dosage*
chemical_list: D000925:Anticoagulants; D014859:Warfarin; D001241:Aspirin